Motormeters&reg; Mini Deluxe Digital Waterproof Back-light Hour Meter Tachometer (Temp/Hour) Displays Current Engine Temperature, RPM & Records Total Engine Run Time Digital Display With Green Backlight Marine Grade Waterproof Design Works on Both Four Stroke & Two Stroke Engines Perfect for Go-karts- Marine Engines - Motorcycles - Generators, PWC, ATV's, Chainsaws, Small Engines