Hour Meter Tachometer Yz 250 Raptor Yfm Wr Wrf Dirt Bik For Motorcycle Atv Sti Scooter This engine monitor is a self-powered LCD Hour meter, Tachometer and Maintenance meter. An internal lithium battery furnishes the power for the monitor. Compatible with: Honda, Sukuzi, Yamaha, Kawasaki, Harley, KTM, Ducati, Aprilia, Vespa, Kymco, Piaagio, Agusta, KTM, BMW Motorcycles / Scootors / Dirt Bikes / ATVs (with all 4 stroke or 2 stroke gas engines) Easy Install: Wrap black wire around sparkplug wire - will work on most engines. Some engines will require hooking up the white ground wire. This hour meter reads up to 10000 hours and then resets to Zero The tachometer reads to 25,000 RPM