[bingo2]

No heater. The CTS is located in the passenger side port where the heater valve would be located and the sender for the analog temperature gauge is in the driver side port. I originally had them installed opposite of their current location but, I changed to more efficiently route the wiring; readings were identical from either location. If I did have a heater, I would try the tee in the driver side port and if it didn't function to my satisfaction I would drill and tap another port as others have suggested.