This is a plug and play harness for moving your coolant temp sensor. The 36in length makes it perfect for relocating the CTS to the passenger head, in the case you have forward facing or upright headers. Extension harness may be used with other GM style temperature sensors such as Oil Temp, Transmission Temp, Etc. This harness will NOT work for extending the IAT/MAT sensor. Please use TPEXT112/TPEXT113 for Air Temp style sensors.