Mercury - Speedometer 65 MPH Boat Speed Monitoring Black Face Brushed Bezel 79-8M6020040. OverviewThis 65-MPH speedometer gives you a clean, steady read on how fast the boat's running without bouncing around when the water gets busy. The needle settles in with an easy, natural sweep, so you can check your speed with just a quick glance. Out on the water, it feels familiar-no guessing, no strange jumps, just a simple read that matches what the boat's doing. It's the kind of gauge you start to tru