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Mounting the temperature switch requires drilling a hole in the top of the thermostat housing (unless your housing has a pipe plug already installed, in which case you simply install the sensor in place of the plug). While it is possible to do so on the car, we opted to remove the housing. Partially drain the cooling system and remove the two 1/2-inch mounting bolts. Unplug the TFI module on the distributor and use a short open-end wrench to access the lower bolt.