JRP Edge 3in1 Digital Water Temp + Water Pressure & Low Coolant Gauge 52mm

Are you in search of the ultimate gauge to monitor and protect your vehicle’s radiator and cooling system? If you own a diesel or petrol engine that's prone to overheating or blowing head gaskets, and you want to monitor every possible metric to detect potential issues before they cause severe damage, look no further. The JRP Edge 52mm 3-in-1 Gauge with Head Guard Ultra is your comprehensive solution for safeguarding your engine.

This innovative gauge goes beyond the basics. In addition to standard features like CPW (Colour Pre-Warn) and low coolant detection, the JRP Edge 3-in-1 gauge introduces a groundbreaking feature: Head Guard Ultra. This proprietary innovation offers a complete approach to monitoring your cooling system, helping to identify issues such as blown head gaskets or a stuck thermostat—problems that can lead to costly engine damage if left undetected.

Head Guard Ultra combines a low coolant sensor and alarm with a water pressure sensor that continuously monitors for abnormal pressure levels in your radiator system. This setup helps detect when the cooling system is pressurizing beyond normal parameters, potentially indicating a problem before it escalates.
 

Key Features:

1. Water Temperature Monitoring with CPW: The gauge provides real-time water temperature readings and includes the CPW system, which alerts you visually when water temperatures begin to rise before a critical threshold is reached. This allows for early intervention, reducing the risk of engine overheating.
    
2. Engine Low Coolant Alarm & Detection: Equipped with a dedicated low coolant sensor, this gauge can instantly alert you if coolant levels drop, which is vital for preventing overheating. For example, if you hit a large rock during off-road driving and lose coolant, the low coolant sensor will trigger an immediate alarm, alerting you to the issue. Typically, this type of low coolant detection system alone would cost nearly $200, but with the JRP Edge 3-in-1 with Head Guard Ultra, it is built into the gauge at a price for all three functions at the cost of this single function alone from other products on the market.
    
3. Water Pressure Monitoring (Head Guard Ultra): The third function sets this gauge apart. The integrated water pressure sensor monitors the pressure within your radiator system, which typically operates between 12 to 20 psi at normal operating temperatures. If the pressure exceeds this range, it indicates a potential problem, such as a blown head gasket or a stuck thermostat. Unlike traditional gauges, this 3-in-1 gauge can detect issues even when the water temperature and coolant levels appear normal. For instance, a stuck thermostat may cause water in the engine to boil without any immediate change in temperature readings or coolant levels. However, the increased pressure will be detected by the water pressure sensor, alerting you to the issue before it leads to severe damage.

Water Temp Readout 0-120c
Water Pressure Readout 0-145psi
Low Coolant Detection System
Numeric & Scale Type Readout Displays
Colour Pre-Warn Feature
Configurable Warnings
Water Temp Warning – High
Water Pressure Warning - High
Engine Low Coolant Alarm
Peak Value Recoding
10-Colour Selectable LCD
3 Selectable opening & Closing Ceremonies
3 Outer Scale Display Type Selections
Daytime Brightness & Colour Selection
Night Brightness & Colour Selection

52mm Water Temp & Pressure Gauge + Low Coolant
52mm Gauge Pod & Mounting Kit
U-Bracket Pillar Mounting Kit
2-Wire 3m 1/8 PT Water Temp Sensor
3-Wire 3m 1/8 PT Water Pressure Sensor
2-Wire 3m 1/8 NPT Low Coolant Sensor
1M Remote Button Controller
1.5M Power Cable
20cm Power Link Cable

Why Choose the JRP Edge 52mm 3-in-1 Gauge with Head Guard Ultra?

Most radiator systems maintain consistent pressure within a specific range during normal operation. A rise above these levels often indicates a significant problem, such as a head gasket failure or a stuck thermostat. Traditional gauges may miss these early warning signs, but the JRP Edge 3-in-1 gauge does not. It continuously monitors water pressure and temperature, ensuring that any unusual conditions are detected immediately.

By identifying these issues early, you can prevent catastrophic engine failure, such as warped cylinder heads, which could require costly repairs or replacements. This gauge provides peace of mind by offering comprehensive monitoring that goes beyond standard water temperature and low coolant alerts.

Ultimate Protection for Your Vehicle

If you own a diesel 4x4 or a petrol engine known for head gasket issues, or if you simply want the best possible protection for your engine's cooling system, the JRP Edge 52mm 3-in-1 Gauge with Head Guard Ultra is an unrivalled choice. No other single 52mm gauge on the market today offers such a complete range of monitoring features for your radiator system, and it comes at a price point that is far from breaking the bank. It is truly one of the most innovative advancements in engine cooling system protection in recent years in the aftermarket gauge space.

COLOUR PRE-WARN

At JRP we are always trying to innovate, and with our deeper than most understanding of the intended use for a gauge and it’s practical function, we always ask ourselves in the development stages how can we make this better. It’s really the heart and soul of what we do here.

So when looking at our 52mm temperature based gauges, we asked ourselves once again how can we make these better for our customers, expand their practical functionality in ways that are actually useful. With the gauges using an incredible 10-colour LCD panel, our engineer put his thinking cap on and came up with a function we call Colour Pre-Warn or CPW for short. Typically gauges will come with one warning you can set and that is it, you would set the warning to go off at a level that is either right on the limit, or because you only have the one warning, you end up being conservative with it and set it lower because you would prefer being warned before it gets to out of control. This normally leads to having alarms going off all the time because you are cautious, or you end up getting sick of being cautious and set alarms a little too aggressively and end up letting a high temp situation get out of control and engine damage happens. We have all been there one way or another.

With the JRP Edge v1.5 temperature gauges, you now have a two stage warning system, one which works the same as other gauges where you set a final value for a warning that will trigger an alarm on the gauge, but now there is a softer secondary warning system you can choose to enable which will pre-alert you that the gauges are reaching higher levels than normal and alert you using the gauges bright colours.

So for example, you have chosen to run blue as your desired running colour for the gauge, set yourself a warning at 100c for water temp, if you enable the “colour pre-warn” function, once the gauge reaches 85c it will change from blue to yellow, and once it hits 90c it will change from yellow to orange, and once you hit 95c it will change from orange to red, and finally once you reach that 100c the gauge will sound an alarm.

The idea behind this is you get a visual non invasive indication that the temp gauge is moving out of normal operating parameters, this allows for a more aggressive final audible warning to be set, along with being visually alerted that your temps are starting to move into high territory’s without nasty loud alarms going off. You will be pre-warned by the gauge changing colour that things aren’t quite right and gives a larger margin for error in catching an event well before it happens.

Now just like everything we do here, we have put a decent amount of thought in how this little function was implemented and could be setup. You are able to customize the colours in the pre-warn function, you can select any 3 colours that you aren’t using as a running colour for the gauge for the warning system. You can also set how sensitive the colour pre-warn is in relation to your primary audible warning you set, we have really tried to make it so setup of this feature is simple, yet it can be customized to suit almost all applications.

We have a video demonstration of the feature in action on this page, just click the Videos tab at the top and you can check it out and see how it works. We feel this feature while sounding simple enough is actually going to become something that a lot of our customers will come to love, no more gauges alarms going off prematurely, no one likes premature alarms, less anxiety around looking at the gauges more than you need to making sure everything is ok and your ears aren’t about to get a pounding, we feel it will be one of those features that on paper you think that’s cool but almost a bit gimmicky, to using it and finding out that it’s been one of the best little innovations you have found in a gauge for years.

Water Pressure & Engine Low Coolant Alarm

This JRP 52mm 3in1 Gauge features an advanced protection system called "Head Guard Ultra." This innovative feature, developed by JRP, is designed to offer superior protection for your engine by continuously monitoring critical parameters within your cooling system, ensuring early detection of potential problems. No other single 52mm gauge in the world offers this combination of readouts and protection for your engine, this really is the ultimate in engine coolant system protection.

How Head Guard Ultra Works

Head Guard Ultra combines a water pressure sensor + low coolant sensor with advanced monitoring capabilities to detect abnormal pressure levels in your radiator system along with low coolant level detection, which can indicate quickly if serious engine issues occur. Under normal conditions, radiator systems maintain a stable pressure range, typically between 12 to 20 psi. However, when issues like a blown head gasket or a stuck thermostat occur, pressure levels can spike dangerously.

• Blown Head Gasket: When a head gasket fails, combustion gases escape into the cooling system, causing a sudden and significant increase in pressure.
   
• Stuck Thermostat: If a thermostat becomes stuck in the closed position, coolant flow is restricted, leading to overheating and the boiling of coolant within the engine. This situation also results in abnormal pressure build-up, potentially causing further damage to the head gasket.
   
• Faulty Radiator Cap: This issue can go both ways, if the radiator cap gets stuck closed, this won’t allow pressure to escape which leads to a build up of pressure in the system. And on the other side, if the cap is stuck in the open position, it can allow your coolant to be syphoned out leading to a loss of coolant. Because our Head Guard Ultra monitors both water pressure and coolant levels, it covers both scenarios, stuck closed cap pressures will rise, while stuck open cap coolant levels drop, this 3in1 will catch both and alert you right away.

Continuous Monitoring for Ultimate Protection

The Head Guard Ultra system is constantly at work, monitoring the pressure within your radiator system, along with coolant level to keep your engine safe. If the water pressure deviates significantly from the normal range—such as a spike from 15 psi to 40 psi—this serves as an immediate warning sign that something is wrong. The gauge provides an instant alert, giving you crucial early notice to prevent extensive engine damage.

Why Early Detection Matters

Catching these issues early can significantly reduce repair costs. For example, detecting a blown head gasket or stuck thermostat before it leads to overheating can be the difference between a minor repair and a major engine overhaul that could cost anywhere from $5,000 to $10,000. Once a cylinder head warps due to excessive heat, replacement is often the only solution—a costly and time-consuming repair. The Head Guard Ultra feature offers a chance to prevent such catastrophic failures by identifying early signs of trouble.

Key Benefits of Head Guard Ultra

1. Water Pressure Monitoring: The water pressure sensor detects any abnormal increases in pressure, providing an early warning of issues such as a blown head gasket or stuck thermostat, which are common causes of overheating and severe engine damage.
    
2. Integrated Low Coolant Detection: Alongside pressure monitoring, the gauge also includes a low coolant sensor that alerts you to drops in coolant levels, preventing overheating due to leaks or other failures.
    
3. Water Temperature Monitoring with CPW Technology: The gauge features our Colour Pre-Warn (CPW) system, which provides color-coded alerts as temperatures rise, ensuring that you have ample warning before reaching critical levels.

Comprehensive Coolant System Monitoring

For those seeking the highest level of coolant system protection, this Edge 3-in-1 Gauge with Head Guard Ultra offers unparalleled functionality. This gauge integrates three vital monitoring features—water temperature, low coolant detection, and water pressure monitoring—into one compact unit. Attempting to achieve this level of monitoring with separate products would cost three to four times more. By combining these features, JRP provides the petrol and diesel 4x4 community with innovative, high-quality, and affordable solutions.

Flexible Display Options for Customized Monitoring

The Head Guard Ultra gauge offers flexibility in how information is displayed. While you have the option to display water pressure directly on the screen, most users prefer to keep water temperature as the primary display while allowing the gauge to silently monitor both low coolant levels and water pressure in the background. With this setup, you benefit from the CPW technology for temperature monitoring and remain confident that any significant change in water pressure or coolant levels will trigger an immediate alert.

Why Choose JRP Head Guard Ultra?

• Proactive Engine Protection: Get ahead of potential failures by detecting early signs of trouble, preventing costly repairs and downtime.
   
• Comprehensive Monitoring: With integrated sensors for water temperature, pressure, and low coolant, you receive complete coverage of all critical cooling system parameters.
   
• Peace of Mind: Whether you're off-roading, towing heavy loads, or driving in extreme conditions, the Head Guard Ultra system continuously safeguards your engine from unseen threats.

By choosing the JRP 52mm 3-in-1 Gauge with Head Guard Ultra, you invest in advanced engine protection, ensuring peace of mind and confidence on every journey. This gauge provides unmatched functionality, combining multiple monitoring features into a single, compact unit designed for the ultimate protection of your vehicle's cooling system.
 

3-Port Radiator Hose Adapter

To simplify the installation process, we have developed a custom 3-port hose adapter specifically for our Water Temp, Water Pressure, and Low Coolant gauge. Unlike standard adapters that typically feature only a single port, our specially engineered 3-port adapter allows for the seamless integration of all three sensors—water temperature, water pressure, and low coolant—into a single connection point. This unique solution eliminates the need to find separate locations for each sensor, ensuring a cleaner and more efficient installation.

Our adapters are available in a variety of sizes, from 28mm to 40mm, accommodating a wide range of engine types and setups. You can find these adapters in our Gauge Accessories section on the website. With this custom solution, installing your Water Temp, Water Pressure, and Low Coolant gauge has never been easier.

Click Here For Range Of 3-Port Adapters

HIGH QUALITY SENSORS

At JRP, we have been dedicated to producing reliable and accurate gauge products for the performance car community, as well as for diesel vehicles both on-road and off-road, since 2016. We understand that customers demand more than just a visually appealing gauge; they need dependable sensors that deliver precision and reliability. Our commitment has always been to provide great-looking gauges with a strong emphasis on functionality and sensor quality, all at a fair price. The Edge range exemplifies this philosophy, offering resilient and precise gauges that ensure long-lasting performance without the need for frequent replacements. Our water temperature sensors are designed with a 2-wire configuration, utilizing the same ground point as the gauge itself, which enhances accuracy compared to traditional single-wire sensors. The water pressure sensors also deliver precise monitoring to help detect any deviations from normal operating pressures, further safeguarding your engine.

Exceptional LCD Panels

The heart of the Edge 52mm digital Water Temp + Water Pressure + Low Coolant gauge is its advanced VA-type LCD display, meticulously designed for this specific gauge series. The clarity and brightness of these displays are immediately noticeable and set them apart from standard LCD gauges. These high-end VA panels, developed over a year-long period, offer exceptional viewing angles and superior brightness, ensuring excellent readability even from off-centre positions—a common shortfall in many LCD gauges. With a brightness level of 600 nits, these displays maintain clear visibility even in bright sunlight, making them suitable for all driving conditions. Additionally, the broad selection of display colours allows users to match the gauge with their vehicle's factory instrument cluster, preserving a cohesive look throughout the cabin.

Durable & Stylish Build Quality

The Edge range stands out with its robust construction. Each gauge is housed in a tough, lightweight alloy body with a polished black finish, providing a sleek and contemporary aesthetic that complements a wide range of vehicle interiors. The LCD screen is protected by a thick, single-piece, scratch-resistant tempered glass panel that subtly protrudes from the gauge, enhancing both durability and style. These gauges are designed to look anything but cheap, combining a modern appearance with quality materials to convey a sense of refinement and reliability.

Effortless Install 

All Edge 52mm gauges come equipped with the Power Link feature, which includes a specialized cable to simplify the power setup for multiple gauges. This feature allows multiple gauges to be powered by a single link cable connected to the primary gauge, reducing the need for separate power connections and minimizing the work involved in crimping or soldering power wires. This efficient setup enables a cleaner, quicker installation process for three or more gauges.

REMOTE CONTROL

Each gauge includes a built-in button for making adjustments, such as setting colour preferences, warning thresholds, and managing peak values. However, the Edge 52mm gauge also comes with an external cabled controller, which can be discreetly installed within easy reach in the cabin. This remote button allows users to make adjustments without removing the gauge from its mount, simplifying the process of updating warning settings, changing colours, or resetting peak values. Whether you choose to hide the controller or install it prominently on your dashboard, managing your gauge settings has never been easier. 

WARNINGS & PEAK VALUES

The Edge 3in1 52mm Water Temp + Water Pressure & Low Coolant gauge allows for full customization of warning thresholds, a vital feature for any quality gauge setup. The built-in buzzer provides an audible alert when your preset temperature exceeds your set threshold, and also if your water pressure starts to move out of normal operating parameters, along with a visual warning symbol will appear on the display. The same is to be said of the low coolant feature, if you lose even a minor amount of coolant in your radiator system, the gauge will alert you right away. The CPW (Colour Pre-Warn) system provides an early, color-coded warning to help you react before any critical damage occurs with water temps. Should the situation worsen quickly, a more urgent alarm will sound. Additionally, these gauges can record peak values, enabling you to check the highest recorded temperatures or pressures at any time without needing to monitor the gauge constantly.