I just experienced the same problem on my car. Reviewed my wiring diagram and show the sending unit is a ground only type switch. The power for the switch is a the meter and the ground wire is the signal wire. I just ordered a new sending unit for mine. could have been a mistake but for 20 bucks a new sending unit is not a big deal Marcel in El Paso ----- Original Message ----- From: "armac.rm" <armac@xxxx> Subject: [DML] temp gauge not working > The temp gauge stays at the rest position. All other gauges work. I > have check the sending unit for a 12 volt ref. key on and found no > voltage at either terminal.(the sending unit is the one on the side > of the water pump driver side right? two wire connector.)