Mercury - Speedometer 45 MPH Boat Speed Monitoring Black Face Brushed Bezel 79-8M6020039. OverviewThis 45-MPH speedometer gives you a simple, steady read on how fast the boat's moving without wobbling every time the hull shifts. The needle settles in with a smooth swing, so you can check your speed with a quick glance and get right back to watching the water. Out on a long run, it feels familiar and easy-no tricks, no guessing. It's just a straightforward gauge that does its job without making a