Mercury – Coolant Temperature Gauge | Dual Scale | Gray Face | 2-1/8" (52 mm) | 79-8M0065962Mercury Coolant Temperature Gauge Dual Scale Gray Face 2 1 8" (52 mm) 79 8M0065962 Overview The Mercury Coolant Temperature Gauge (79 8M0065962) gives you a clear picture of your engines cooling performance at a glance. The dual scale display reads in both Fahrenheit and Celsius, so its easy to monitor in your preferred units. The gray face, clean white numerals, and glass lens provide a sharp, professional appearance that ties in perfectly with