The RS fan switch with two stages switches the fan on earlier and thus prevents the motor from overheating. Fan switch stage 1 at 80°C/stage 2 at 85°C. Including pre-assembled plug. We recommend to use the complete kit with water thermostat . Connections for temperature sensor: Red = continuous positive (30A back-up fuse required) White = Fan stage 1 Black = Fan stage 2 Tightening torque: 50 Nm Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com