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 a suitable position and fix the watch with screws. Inductive Digital Hour Meter Waterproof LCD Display for Motorcycle ATV Snowmobile Marine Boat Ski Gas Engine not tachometer model Features: Brand new and high quality Track the service life of vehicle-oil changs, valve, adjustments, for spark plugs, etc. Easy to install Peel and stick No battery needed - connect to for spark plug wire Works on Any Gas Engine Record and display to 9,999.9 hours Hour glass symbol appears and flashes on or off to indicate counting time Automatic roll over Resolution: 0.1 hour 100 percent epoxy encapsulated casing resists water, shock, stand fire of 85CSpecification: Item size: 54x36.5x14.5mm Packing content: 1 x Hour meter 1 x Wire 2 x Screw About Our Company We are a professional car accessories supplier.We provide the high-quality goods and good services, you can buy confidence in my store. If there is any question,please