Waterproof Tachometer RPM Meter with Hour Meter 0-4000 RPM 85mm 9-32V with Backlight

Cut an 85mm diameter hole, 70mm deep, insert a gauge, and secure it. Adjustable speed range: 1-300. You can press the back button to adjust it. The idle speed is typically 600-800 RPM. Suitable for diesel and gasoline engines. The tachometer can receive signals from the engine, ignition coil, crankshaft sensor, or tachometer sensor (sold separately), etc. It displays RPM and hours. Hour meter cannot be reset. Red backlight, operating voltage 9-32VDC (12VDC/24VDC)