The RS fan switch with two stages switches the fan on earlier and thus prevents the motor from overheating. Fan switch level 1 at 80° C / level 2 at 85° C. We recommend to use the complete kit with water thermostat. Connections for the temperature sensor: Red = Continuous plus (30A back-up fuse required) White = Fan speed 1 Blue = 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