I just realized I sent you to the lambda temp switch. The sending unit for the temperature gauge is on the right hand cylinder head in the front of the motor, see 1-1-5 in the parts manual. Sorry for the misinformation. You should be able to reach it easily. Check first to see if the wire is even connected. When working in that area it is easy to knock off connections without realizing it. It is supposed to be a green/blue wire and it is probably just dangling in there. David Teitelbaum vin 10757