Mercury – Coolant Temperature Gauge | Dual Scale | Black Face | 2-1/8" (52 mm) | 79-8M0052842

Overview

The Mercury Coolant Temperature Gauge (79-8M0052842) gives you an accurate, at-a-glance view of your engine’s cooling system. It features a dual-scale face that reads in both Fahrenheit and Celsius, making it simple to monitor temperature in your preferred unit. The black face, white markings, and glass lens provide a clean, sharp look that matches Mercury’s OEM dash styling. It fits a standard 2-1/8" (52 mm) hole and works with SmartCraft-equipped engines that have coolant temperature sensors installed.

Key Features

• Dual-Scale Readout – Displays coolant temperature in both °F and °C.
• Black Face & Glass Lens – Easy-to-read layout with a classic Mercury OEM appearance.
• Standard 2-1/8" (52 mm) Dash Fit – Fits common gauge holes for quick installation.
• SmartCraft-Compatible – Integrates with Mercury systems that include coolant temperature sensors.
• Accurate & Responsive – Provides real-time engine temperature data to prevent overheating.
• Marine-Grade Construction – UV-stable, corrosion-resistant, and vibration-tested for marine use.
• OEM Fit & Finish – Matches other SC1000 and SmartCraft black-face gauges.

Compatibility

• Fits: Mercury SmartCraft-equipped boats (functionality depends on engine model and available sensors)

Performance & Practical Benefits

This coolant temperature gauge helps you keep your motor running safely and efficiently. You’ll know right away if your engine’s running too cool or too hot, helping prevent performance issues or damage. The black face ties in perfectly with Mercury’s SC1000 black-face series, giving your dash a clean, factory look that performs as good as it looks.

Why Buy OEM

Mercury gauges are engineered for marine environments and tested for heat, vibration, and corrosion resistance. With genuine OEM parts, you get factory accuracy, proven reliability, and a perfect match for your existing SmartCraft system and styling.

FAQ

Q1: What temperature units does it display?
It shows coolant temperature in both Fahrenheit and Celsius.

Q2: What dash opening does it fit?
A standard 2-1/8" (52 mm) gauge hole.

Q3: Does it work with all Mercury engines?
It’s designed for SmartCraft-capable engines that have coolant temperature sensors.

Q4: Is installation simple?
Yes — it mounts easily and connects through your existing SmartCraft wiring.

Q5: Is this an OEM gauge?
Yes — it’s a genuine Mercury Marine part, built to factory specifications.