PartsSquare 185 To 200 Degree Electric Fan Thermostat Sensor Temperature switch 50 amp Relay Kit Replacement for : 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 COMES ON AT 200 Degrees AND TURNS OFF AT 185 Degrees, It is a 3/8" pipe thread. This kit includes everything you'll need to hook up to your fan, includes a brass adapter to install the sending unit, wires, relay switch, circut breaker, terminals and mounting screws. This kit is set up to turn your electric fan on at 200 degrees and shut off at 185 degrees and will work with any 12 volt system. High Quality Replacement Part, have no-worry 12 months warranty. 50 AMP Relay 48&#034; of Wiring 12-18 GAUGE Temperature Sensor Circuit Breaker Assorted Connectors And Terminals COMES ON AT 200 Degrees AND TURNS OFF AT 185 Degrees 1.Turning off the engine, replace the new cooling fan temperature switches after the water in engine radiator cooled to the room temperature. 2.Avoid the external high heat source after installation. 3.Avoid sprinkling water on surrounding auto parts during the installation. THIS KIT IS A MUST HAVE WHEN USING AN ELECTRIC FAN IN YOUR HOT ROD OR STREET ROD FITS MOST HOT RODS AND CLASSICS ENGINES INCLUDING GM (CHEVY, GMC, OLDS, CADILLAC, PONTIAC, BUICK, FORD, &amp; MOPAR (CHRYSLER, DODGE, PLYMOUTH) PLEASE MEASURE TO MAKE SURE THIS IS THE RIGHT SIZE AS 7&#034; 10&#034;12&#034;14&#034;16&#034; ELECTRIC FANS 1.Locate the cooling fan switch near the thermostat housing on the left side of engine behind the distributor assembly. The switch wire colors should be green and black. 2.Disconnect the wire terminal from the cooling fan switch. 3.Allow the engine to reach a coolant temperature of 196-203F (91-95C). 4.Using a suitable ohmmeter or continuity tester, check for continuity between the two fan switch terminals. The fan switch should have continuity (switch closed) at the above temperatures. The switch should have no continuity (switch open) when the temperature drops between 5-15F (3-8C) from the temperature that the switch first had continuity (switch closed). 5.If the switch does not operate within the range of the supplied information, allow the engine to cool below 100F (37C) and replace the switch. Not remanufactured or rebuilt. High Quality Replacement Part. Exact Fit for easy installation. 100% Brand New and tested prior to leaving the factory.