Mercury – Water Temperature Gauge C–H (120–240°F) | Cooling System Monitoring | Black Face | Black Bezel | 79-8M6020034Mercury Water Temperature Gauge CH (120240F) Cooling System Monitoring Black Face Black Bezel 79 8M6020034 OverviewThis water temperature gauge gives you a steady look at how warm the engines 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 dont have to stare at itjust a quick glance tells you if things are running in the zone or creeping hotter than