Surface Mounted Inductive Hour/Tach Meter. Works on any gasoline engine up to 8 cylinders. The meter shows total hours accumulated when engine is off. Shows tachometer when engine is running. Installation is easy with simple one wire wrap around spark plug boot or wire. Green backlighted LCD 1-5/8"W x 5/8" display Built in replaceable battery and battery level indicator. Includes log book for service recording. Peel & stick mounting, no wiring necessary. 60" Pick-up wire. One year warranty. Size 2-1/8" L x 1-1/2" W x 5/8" D