Mercury – Water Temperature Gauge C–H (120–240°F) | Cooling System Monitoring | White Face | Black Bezel | 79-8M6020058

Overview
This 120–240°F water-temperature gauge gives you a steady sense of how warm the engine’s running without the needle jumping every time the boat shifts. The sweep is smooth enough that small changes are easy to notice, which helps when you’re running skinny water or pushing through chop. Out on the water, it feels like one of those quiet checks you make out of habit—quick glance, clear answer, and back to the ride. It’s a simple, dependable tool that keeps you in tune with the engine.

Key Features
    • 120–240°F Scale – Covers the heat range most outboards and sterndrives run in.
    • Steady Needle Sweep – Stays calm through chop, trim changes, and throttle adjustments.
    • Standard Dash Fit – Sits neatly in common dash openings.
    • Backlit Display – Easy to read when the light drops or weather rolls in.
    • Marine-Durable Build – Handles vibration, spray, and long days on the water.

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

Performance & Practical Benefits
On the water, this gauge helps you spot early signs of overheating before alarms or symptoms show up. The stable sweep makes it easier to notice small rises when you’re trimmed high, in weedy areas, or running hard in warm conditions. It’s quick to read without breaking your focus, which keeps the boat running where it should. Over time, it becomes one of those quiet “checks” that keeps everything feeling safe and predictable.

Why Buy OEM
OEM gauges match Mercury’s sender signals exactly, which keeps the reading honest instead of wandering. They hold up well to real running conditions—vibration, heat, spray, and temperature swings. Most boaters stick with OEM because it removes the guesswork.

FAQ
1. How do I know if the temperature gauge is failing?
If the needle sticks, jumps, or refuses to change even when the engine warms up, it’s likely fading.

2. Does this gauge need calibration?
Most setups read correctly right away, but checking the sender connection during install is smart.

3. How does it handle saltwater?
A quick rinse after each run helps it last through saltwater seasons without issue.

4. Anything important during installation?
Good grounds and clean wiring help the needle move smoothly and read accurately.

5. What does overheating look like on this gauge?
You’ll see the needle climb toward the upper end and stay there under load.