Temperature switch turns on fan approximately at 185 Degrees and Off at 175 Degrees. The temp sensor has a 3/8 inch pipe thread, and a 1/2 inch adapter included. Please note: you need to run a 160 degrees thermostat when running this kit with this temp switch. If you got a thermostat above 160 degrees (say 180 thermostat) , your engine not get cool enough for the fans to shut off The temperature switch supplied with this kit is style to mount in the cylinder head of the engine or any water jacket if needed. The temperature switch MUST be grounded through the threads to the engine in order for it to work, and the engine MUST be grounded This relay kit is enough to run two medium profile or low profile cooling fans. For high profile fans, you can use heavy duty relay kit P 30247. Or crimp/solder bigger wires yourself for pin 30 & 87 to carry enough load for the fan Color: Black Material: plastic Package Contents: 1x Dual Electric Fan Relay Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.