Mercury - Tachometer Gauge 7K Engine Speed Monitoring Black Face Brushed Bezel 79-8M6020038. OverviewThis 7,000-RPM tachometer gives you a clean, relaxed read on how the engine's running, even when the water's a little unsettled. The needle doesn't fuss or bounce-it just settles in and moves the way you expect when you throttle up or ease off. Out on the water, it becomes part of your normal rhythm at the helm: a quick glance, a quick read, and back to watching the shoreline or the next wave. It