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My t660 didn’t come with an engine oil temp gauge. So I bought one to install myself. My question is, is the wiring already in the dash or do I need to buy the harness, and also sending unit sensor.?
Rowland

Did you buy the paccar gauge or is it an aftermarket? If you bought the paccar gauge you'll need to daisy chain it in with the other gauges and then turn it on using the Paccar ESA program.

I bought an original kenworth gauge for my year model.