Mercury - Speedometer 45 MPH Boat Speed Monitoring White Face Black Bezel 79-8M6020051. OverviewThis 45-MPH speedometer gives you a clear, steady sense of how fast the boat's moving without wobbling every time you hit a bit of chop. The needle has an easy, natural sweep, so checking your pace feels quick and effortless. Out on the water, it settles in fast-one glance and you know where you're sitting. It's a simple, everyday gauge that blends right into the rhythm of the run.. Key Features • 45-