Mercury – Oil Temperature Gauge | Dual Scale | Gray Face | 2-1/8" (52 mm) | 79-8M0065978Mercury Oil Temperature Gauge Dual Scale Gray Face 2 1 8" (52 mm) 79 8M0065978 Overview The Mercury Oil Temperature Gauge (79 8M0065978) gives you quick, accurate readings of your engines oil temperature so you can make sure everythings running in the safe zone. The dual scale display reads in both Fahrenheit and Celsius, letting you monitor in your preferred unit. The gray face, clean white numerals, and glass lens provide a modern OEM look that