The ESD5550 is a universal generator governor / engine speed controller equipped with Smoke Limiting, & Idle Speed. Suitable for diesel, gas and natural gas engines with Built-in & Non-Built-in PTs Pumps, also can be used with Low Current, Electric over Hydraulic Oil Pumps Type Governor Actuators. It's compatible with following model. Cummins 4913988-BI, 3419988, 3098693 and 3044196 AVR. GAC ESD5500 and ESD5500E. Woodward EPG P/N 8290-189,8290-038, and ESD5500E K77255.