Mercury – Water Temperature Gauge C–H (120–240°F) | Cooling System Monitoring | Black Face | Black Bezel | 79-8M6020034

Overview
This water temperature gauge gives you a steady look at how warm the engine’s running without twitching every time the hull moves. Out on the water, the needle settles into a calm sweep, so any change stands out right away. You don’t have to stare at it—just a quick glance tells you if things are running in the zone or creeping hotter than they should. It feels like one of those quiet tools that keeps you ahead of trouble.

Key Features
    • 120–240°F Range – Covers the full operating window for most marine cooling systems.
    • Smooth Needle Action – Holds steady through chop, turns, and throttle shifts.
    • Standard Dash Fit – Installs cleanly in common panel cutouts.
    • Backlit Face – Easy to read during early or late hours on the water.
    • Marine-Ready Build – Handles vibration, spray, and long seasons.

Engine & Boat Compatibility
    • FourStroke outboards
    • Verado series
    • Pro XS engines
    • SmartCraft systems

Performance & Practical Benefits
On the water, the gauge gives you a natural feel for engine temperature without overthinking it. The needle doesn’t bounce, so even small changes show up clearly when you’re trimming up, running skinny, or pushing into chop. It helps you catch heat-related issues before they turn into bigger problems. Over time, it becomes one of those things you rely on without even noticing.

Why Buy OEM
OEM gauges line up with Mercury sensors and electronics, which keeps the readings consistent. They hold calibration well and stand up to vibration and weather better than cheaper alternatives. Most boaters choose OEM because it keeps the cooling system story honest.

FAQ
1. How do I know if my temperature gauge is failing?
If the needle jumps, sticks, or shows the same temperature all day, it’s usually wearing out.

2. Does this gauge require calibration?
Most setups read correctly right away, but checking sender and wiring during installation is smart.

3. How does it handle saltwater?
A quick rinse after your trip keeps it in good shape through saltwater seasons.

4. Anything important to watch during installation?
Clean grounds and tidy wiring help the gauge react smoothly and accurately.

5. What does an overheating engine usually look like on this gauge?
The needle will start creeping toward the upper end and stay there under load.