Mercury - Cruiselog Gauge Speed & Trip Monitoring Black Face Brushed Bezel 79-8M6020044. OverviewThis Cruiselog gauge gives you an easy way to keep track of your speed and how far you've gone during the day. The needle moves in a calm, steady arc, so you're not dealing with jitter or jumpy readings when the boat rocks. Out on the water, it feels natural to check-almost like glancing at the horizon or the depth finder. It's a simple, everyday gauge that just makes the ride feel a little more orga