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Mercury – Voltmeter 8–18V | Electrical System Monitoring | White Face | Black Bezel | 79-8M6020057 Boat Cleaners - Protectants - Degreasers Genuine Mercury Marine oil isn’tMercury Voltmeter 818V Electrical System Monitoring White Face Black Bezel 79 8M6020057 OverviewThis 818V voltmeter gives you a straightforward look at how your electrical system is doing without bouncing around every time the boat moves. The needle settles into a calm, predictable sweep, so any dip or spike is easy to catch with a quick glance. Out on the water, it becomes a simple habitcheck it, nod, and get back to running the boat. Its the kind of