Aimila Digital Inductive Tachometer Tach Hour Meter RPM Resettable Hourmeter for Gas Engine Motorcycle Silvery This tachometer hour meter used on any gasoline engine,motorycle,snowmobile,atv,jet ski,motocross,boat,generator,etc. Easy Installation - No Battery Required - cable connects to spark plug wire. Records and Displays to 99999 hours/30600 RPM. Speed/filter display update can be set to 1s or 0.5s. Waterproof