Mercury - Tachometer 6K Engine Speed Monitoring White Face Brushed Bezel 79-8M6020061. OverviewThis 6,000-RPM tachometer gives you a straightforward read on engine speed without jitter or bounce when the boat moves around. The needle settles into a smooth arc, making it easy to check your RPMs with a quick glance. Out on the water, it feels natural-what you see on the gauge matches what you hear from the engine. It's a simple, dependable piece of gear that blends right into your normal routine a