RacingPowerSports Backlight Digital Tachometer and Hour Meter for 2 or 4 Stroke Gasoline Engines (Motorcycle, Marine Boat, ATV, Snowmobile, Generator, Mower, etc...) Accumulate total running hours (TOT), recording partial running time (JOB), Customizable warnings and maintenance reminders from 1-9999 hours with alert service alarms. Display RPMs, record and view MAX RPMs, Overspeed warning. Read up to 20,000 RPMs with 10 RPM resolution and 99,999.9 hours with 0.1 hours resolution.