Warning Light Above 212°F

An integrated warning lamp illuminates when the measured coolant temperature rises above 212°F.

The warning provides an additional visual alert, but it does not automatically mean every engine is overheating at exactly 213°F. Pressurized cooling systems can normally operate above the boiling point of unpressurized water, and normal temperatures vary by engine, thermostat, vehicle load and operating conditions.

Watch for continued temperature increases, coolant loss, steam or other warning signs. A light gets your attention. Diagnosis still requires a human, at least until dashboards become judgmental enough to do that too.

Red LED Nighttime Illumination

The bright red illumination makes the display easier to see in low-light conditions. It also complements many red or amber factory instrument panels and aftermarket gauge setups.

Install the gauge where it can be checked without blocking the driver’s view or requiring attention to be taken away from the road.

Universal 2-Inch 52mm Design

The compact 2-inch, or 52mm, housing fits many universal gauge pods, mounting panels and custom dashboard openings.

Potential applications include compatible:

• Passenger cars
• Pickup trucks
• SUVs
• Tow vehicles
• Performance cars
• Engine-swapped vehicles
• Boats and marine vehicles
• Custom automotive builds

Universal fitment still requires verifying the mounting opening, sender location and electrical compatibility before installation.

10–15V DC Operating Range

The WATERWICH gauge is designed for nominal 12V electrical systems and operates from 10–15V DC.

It is not intended for direct connection to 24V systems unless a suitable voltage reducer is installed. Supplying excessive voltage can damage the gauge, which is a very efficient but unpopular method of testing its smoke-retention capabilities.

Product Specifications

• Brand: WATERWICH
• Product type: Digital water-temperature gauge
• Gauge diameter: 2 inches / 52mm
• Temperature range: 104–300°F
• Measurement unit: Fahrenheit
• Warning threshold: Above 212°F
• Display illumination: Red LED
• Power supply: 10–15V DC
• Nominal system voltage: 12V
• Sender thread: 1/8-inch NPT
• Installation type: Universal electrical
• Application: Compatible automotive and marine cooling systems
• Manufacturer part number: WATERWICH-SK-GZYB122

The listed specifications are consistent with the current WATERWICH product information.

What’s Included

• WATERWICH 52mm water-temperature gauge
• Matched temperature sender
• Electrical wiring
• Installation components

Depending on the vehicle, you may also need:

• Thread adapter
• Radiator-hose sender adapter
• 52mm gauge pod
• Additional automotive wiring
• Fuse holder and fuse
• Electrical connectors

Why Install a Digital Water-Temperature Gauge?

Many factory gauges do not display the engine’s actual coolant temperature. Some remain near the middle of the scale across a broad temperature range and only begin moving toward hot after a problem has already developed.

A dedicated digital gauge can help you:

• See the actual coolant-temperature reading
• Detect temperature changes earlier
• Monitor cooling performance under load
• Verify electric cooling-fan operation
• Diagnose intermittent overheating
• Monitor an engine swap
• Evaluate cooling-system upgrades
• Add a gauge to vehicles without adequate factory instrumentation

If rising temperatures are accompanied by leaks, corrosion or coolant loss, review our guide to the seven signs of a failing radiator.

Installation Notes

Install the included 1/8-inch NPT sender in a compatible coolant passage where it remains in contact with circulating engine coolant.

Possible installation locations include:

• Cylinder head
• Intake manifold
• Thermostat housing
• Coolant outlet
• Engine block
• Inline radiator-hose adapter

Before beginning installation:

• Allow the engine to cool completely.
• Disconnect the negative battery terminal.
• Verify the available sender-port thread.
• Use the correct adapter when required.
• Install a fuse in the gauge power circuit.
• Route wiring away from exhaust components.
• Keep wiring clear of belts, pulleys and cooling fans.
• Provide clean electrical power and ground connections.
• Bleed air from the cooling system afterward.
• Inspect all fittings for leaks before driving.

Use thread sealant carefully. Excessive sealant or Teflon tape can electrically isolate some senders and cause inaccurate readings.

For more background, read our guide explaining how an engine coolant temperature sensor works.

Frequently Asked Questions

What temperature range does this gauge display?

The WATERWICH gauge displays coolant temperatures from 104°F to 300°F.

When does the warning lamp activate?

The warning lamp illuminates when the measured temperature exceeds 212°F.

Does 212°F always mean the engine is overheating?

Not necessarily. Many pressurized automotive cooling systems normally operate near or above 212°F under certain conditions. Compare the reading with the vehicle manufacturer’s expected operating range and watch for continued increases.

Is this gauge compatible with 24V vehicles?

Not directly. It is designed to operate from 10–15V DC on a nominal 12V system. A compatible voltage reducer would be required for a 24V application.

Is the temperature sender included?

Yes. The gauge includes a matched temperature sender with a 1/8-inch NPT mounting thread.

Can I use the factory coolant-temperature sender?

The included sender should be used unless compatibility with another sender has been confirmed. Different senders can use different resistance curves, resulting in inaccurate readings.

Can this gauge be used in a boat?

It can be used in compatible 12V marine cooling systems. Confirm that the installation location and electrical connections are adequately protected against moisture and corrosion.

Is this suitable for measuring human or animal temperature?

No. This gauge is designed exclusively for compatible automotive and marine cooling systems. It is not a medical, veterinary or food-temperature instrument. Humanity survives another important warning label.

What should I do if the temperature continues rising?

Reduce engine load and pull over safely. Shut the engine off if the reading keeps climbing, coolant escapes, steam appears or another temperature warning activates. Never remove a radiator cap while the cooling system is hot.

Review our guide on how to deal with an overheating engine before continuing to drive.

Clear Digital Coolant-Temperature Monitoring

The WATERWICH 52mm water-temperature gauge provides a useful combination of digital monitoring, bright red illumination and an integrated warning light above 212°F.

With its 104–300°F display range, 10–15V operating voltage and included 1/8-inch NPT sender, it is a practical option for compatible cars, trucks, SUVs, project vehicles and marine applications.