Runleader RL-HM028 Inductive tachometer with hour meter voltmeter backlit display for all gasoline engine ATV UTV dirtbike motobike motocycle outboards snowmobile pitbike PWC marine boat waterproof Multifunction hour meter tachometer voltmeter with Colck for Gasoline Engine. When engine is on,display current RPM,when engine is off,display total running hours Maintenance reminder service,user can set it from 0 hours to 200 hours .RPM refresh can be set 0.5s or 1s Records and Green backlight Displays to 99999 hours/30000 RPM ,Partial hours can be reset to zero, Max RPM recall Easy Installation.No Battery Required - connects to spark plug wire,Battery can be replaceable. Waterproof IP68