Install Operation: Wrap the end of the induction wire around the spark plug tube 5 times, then fix it with a cable tie, then insert one end of the induction wire into the groove on the back, find the right position and fix the watch with screws. Inductive digital hour meter waterproof LCD display for motorcycle ATV snowmobile marine gas engine ski no tachometer model Features: Brand new and high quality Track the life of your car oil changers, valve, adjustment, spark plugs etc. Easy to install Peel and stick No battery required - connect to spark plug wire Works on any gas engine Recording and Display up to 9,999.9 hours Hourglass symbol appears and flashes on/off to indicate counting time Auto flip Resolution: 0.1 hours 100% epoxy housing is waterproof, shockproof, stand fire 85 deg; c Specification: Product size: 54 * 36.5 * 14.5 mm Package content: 1 x hour meter 1 x wire 2 x screw About our company We are a professional supplier of car accessories. We provide high quality goods and good services, you can buy with confidence in my store.