JJCOCO Water Temperature Gauge 52mm 1/8NPT Sensor — 300°F LED Display with Alarm & Peak Recall

JJCOCO 52mm water temperature gauge is a compact digital instrument with a 1/8 NPT corrosion-resistant sensor, bright LED readout, customizable overheat alarm and peak-temperature recall for cars, trucks, boats and RVs.

This gauge measures fluid temperatures from 32°F to 300°F (0°C to 150°C) and runs on 12V/24V DC systems. It combines a plug-and-play, factory-sealed sensor connector and a clear, high-contrast LED to give reliable real-time readings while drawing only 0.3A. The unit ships with a mounting bracket, adhesive backing and easy wiring guidance so you can install a working temperature monitor quickly without cutting wires.

How does the alarm protect my engine during towing or off-road use?

The built-in WARN alarm lets you set a temperature threshold that triggers a flashing alert to warn of overheating. Long-press the WARN button to program the limit; the setting auto-saves so you don’t have to reconfigure it after power cycles. The visual alarm is designed to be noticed during demanding runs where coolant or transmission temps can spike unexpectedly.

• Customizable alarm threshold via long-press WARN button
• Flashing visual alert to attract attention while driving
• Auto-save of settings after 3 seconds to retain preferences
• Useful for towing, off-roading, heavy loads, and performance driving

What does peak recall do and when should I use it?

The PEAK function holds the highest temperature recorded since the last reset so you can review spikes after a run. One press of the PEAK button displays that maximum reading, aiding diagnosis of intermittent cooling or transmission issues. Use it after towing, hard climbs, or spirited driving to see if temperatures exceeded safe limits.

• Instant display of highest recorded temperature with one click
• Helps identify transient overheating not caught in real time
• Useful for troubleshooting cooling system performance
• Works for coolant, transmission, or hydraulic fluid monitoring

How difficult is installation and what wiring does it require?

Installation typically takes about three minutes when following the simple wiring directions: red to positive, black to ground. The sensor uses an OEM-style sealed connector—no cutting or splicing—so the factory wiring and fluid seals remain intact. A mounting bracket and adhesive backing are included to allow dash or panel placement without advanced tools.

• Plug-and-play sealed sensor connector; no wire splicing
• Simple two-wire power: red (+), black (-); 12V or 24V DC compatible
• Includes bracket and adhesive backing for tidy mounting
• Installation tips: always disconnect power before wiring

Is this gauge durable enough for marine and heavy-duty vehicles?

The JJCOCO gauge is built for vibration and corrosion-prone environments. The NPT 1/8" sensor resists oil and coolant exposure, and the housing is shock-resistant to handle rough roads, engine bays and marine vibrations. Low current draw and over-voltage protection help safeguard both the gauge and vehicle electrical systems.

• Corrosion-resistant NPT 1/8" sensor for fluid-facing use
• Shock- and vibration-resistant construction for harsh conditions
• Over-voltage protection suitable for heavy-duty applications
• Low 0.3A current draw to preserve battery life during long monitoring

Who is this for: drivers, fleet operators and marine owners who need fast, reliable fluid-temperature feedback—especially those who tow, haul or run high-performance engines. If you want a compact, accurate digital gauge that installs quickly, avoids cutting factory wiring and provides a visible overheat alert plus peak recall, the JJCOCO 52mm water temperature gauge is purpose-built for monitoring coolant, transmission and hydraulic temperatures across cars, trucks, RVs and boats.