Mercury - Cruiselog Gauge Speed & Trip Monitoring White Face Black Bezel 79-8M6020056. OverviewThis Cruiselog gauge gives you a clear, easy way to keep an eye on speed and distance while you're out on the water. The needle moves in a relaxed, steady swing, so you're not fighting with jittery readings every time the boat shifts. It's the kind of gauge you glance at out of habit-quick read, then right back to steering or watching the water ahead. Simple, steady, and useful on any long or busy day