Surface Mounted Inductive Hour Tachometer Meter. Works on any gasoline engine up to 8 cylinders. Knowing what to service and when, is the key to a successful preventative maintenance program for your motorcycle, ATV, PWC, Boat and Generator. Meter display can be read at all times. The hour tachometer meter shows total hours accumulated when engine is off. Shows Tachometer when engine is running. Adjustable inductive inputs for multiple spark combinations. Installation is easy with simple one wire wrap around spark plug boot or head of pen stick coil. Green backlighted LCD display measures 1 5/8" wide x 5/8" high. Built in replaceable battery and battery level indicator on screen display.