Searon Digital Gasoline Diesel Engine Hour Meter Tachometer for Generator Excavator Tractor Titch Cleaner Agrosprayer Truck Forklift Digital tach hour meter tacometer for Generator Excavator Tractor Titch Cleaner Agrosprayer Truck Forklift... Works on Part of Gasoline Engines and Diesel Engines. Before purchasing, please find the installation illustration above Read up to 30,600 RPMs with 10 RPMs accuracy.RPM Refresh rate is 2 seconds Read up to 99,999.9 hours with 0.1 hours accuracy Easy to install and Complete Waterproof