Rotary Corp brand aftermarket product. The GDI Panel Mount Inductive hour meter needs only one wire tobe connected and it mounts easily in a dash or instrument panel. It can be programmed with Flash Alert Service Alarms and Tachometer function for 1 or 2 cylinder gas engines. Panel mounted tachometer Fits Bad Boy. Used on most machines with carbureted engines. Minimum cut out width .952" (24.18mm), Minimum cut out height 1.452"(36.88mm).