Mercury - Speedometer 65 MPH Boat Speed Monitoring Black Face Chrome Bezel 79-8M6020004. OverviewThis 65-MPH speedometer gives you a steady, true-feeling read on how fast the boat's running. The needle settles in smoothly instead of jumping every time you cross a wake, so your speed is easy to catch at a glance. Out on the water, it lines up naturally with how the hull feels, whether you're cruising easy or opening it up a bit. It's a clean, straightforward gauge that just does its job.. Key Fea