Install Operation: Wrap the end of the induction wire around the spark plug tube 5 times, then secure it with a cable tie. Insert one end of the induction wire into the groove on the back. Position the unit and secure it with screws. Inductive Digital Hour Meter with Waterproof LCD Display for Motorcycle, ATV, Snowmobile, Marine Boat, Jet Ski, and Gas Engine – Not a Tachometer Model Features: - Tracks vehicle service life for oil changes, valve adjustments, spark plugs, and other maintenance - Easy to install – Peel and stick design - No battery required – Powered through connection to spark plug wire - Works with any gas engine - Records and displays operating time up to 9,999.9 hours - Hourglass symbol flashes to indicate active counting - Automatically rolls over after reaching maximum value - Resolution: 0.1 hour - Fully encapsulated in 100% epoxy for water resistance, shock resistance, and durability at temperatures up to 85°C Specifications: - Item size: 54 x 36.5 x 14.5mm Package Includes: - 1 x Hour Meter - 1 x Induction Wire - 2 x Screws