General description This 175-185 degree electric fan thermostat relay switch kit is designed for your cooling system, featuring a 12V 40 Amp 4 Pin Relay and Pigtail. It includes all necessary components to connect to your fan unit, including a relay switch, circuit breaker, terminals, wires, and mounting screws. The kit is set to activate your electric fan at 185 degrees and deactivate it at 175 degrees, making it compatible with any 12-volt system. Technical specifications Operating Voltage: 12V Relay Rating: 40 Amp Temperature Activation: Turns on at 185 degrees, off at 175 degrees Cable Length: 0.165 cm Compatible Engines: 265, 283, 305, 307, 327, 350, 383, 400, 396, 402, 427, 454, 472, 502, 260, 289, 302, 351W, 347, 352, 360, 390, 406, 427, 428, 429, 460, 351C, 351M, 400M, 273, 318, 340, 360, 361, 383, 400, 413, 426W, 440, 455, 330, 326 Engines Installation Mount the relay under the hood in a convenient location near the fan. Install the thermostat into the head or intake