• One (1) piece OZ-USA® Tach/Hour Meter. Works on all gas engines. 
• Large LCD display with back-light. Water proof. Replaceable battery. 
• Max RPM recall, rpm alert, resettable maintenance hours. 
• Non resettable total hours. No power required, easy installation, just wrap the black wire around your spark plug cable. 

 0.5 sec rpm refresh rate. 20000 max rpm.  99999 max hours. Will display RPM automatically when engine is running. Will display HOURS when engine is off. Measurements: 2.5" x 1.25" x 0.75 (65mm x35mm x 15mm)  Applications: All gas operated engines, motorcycle, atv, utv, boat, outboard, trucks, race applications, ultralight, go-cart, golf cart, hotrod. 1 year warranty