Install Operation:<br> 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.<br> Inductive Digital Hour Meter Waterproof LCD Display for Motorcycle ATV Snowmobile Marine Boat Ski Gas Engine, not tachometer model<br> Features:<br> new and high quality<br> Track the service life of vehicle-oil changes, valve, adjustments, for spark plugs, etc.<br> Easy to install<br> Peel and stick<br> No battery needed - connect to for spark plug wire<br> Works on Any Gas Engine<br> Record and display to 9,999.9 hours<br> Hourglass symbol appears and flashes on/off to indicate counting time<br> Automatic rollover<br> Resolution: 0.1 hour<br> 100% epoxy encapsulated casing resists water, shock, stand the fire of 85°C<br> Specification:<br> Item size: 54*36.5*14.5mm<br> Packing content:<br> 1 x Hour meter<br> 1 x Wire<br> 2 x Screw