This Genuine Tohatsu Marine Part is an ECU ASSY (25) with the part number 3VT-06401-0. The ECU, or Engine Control Unit, is a crucial component in the functioning of the marine engine. It is responsible for monitoring and controlling various aspects of the engine's performance, such as fuel injection, ignition timing, and emissions. This specific ECU ASSY is designed for Tohatsu marine engines with a power rating of 25 horsepower. It is a genuine Tohatsu part, ensuring high quality and compatibility with your Tohatsu marine engine.