Mercury - Speedometer 65 MPH Boat Speed Monitoring White Face Black Bezel 79-8M6020052. OverviewThis 65-MPH speedometer gives you a calm, steady look at how fast the boat's moving, even when the water's a little bumpy. The needle doesn't twitch or wander-it just settles in and follows your pace with a smooth swing. Out on the water, it feels natural to check: one quick glance and you've got your number. It's the kind of gauge that blends into the day and makes running the boat feel a little more