OZ-USA Tach Hour Meter tachometer RPM backlit display motorcycle atv dirtbike buggy outboard mototcycle boat works with all gas powered engines OZ-USA Tach/Hour Meter. Works on all gas engines Large LCD display with back-light. Replaceable battery IP67 Water proof No power required, easy installation, just wrap the black wire around your spark plug cable. Max RPM recall, rpm alert, resettable maintenance hours. Non resettable total hours.