the temp guage on my 66 isn't working. All others are. Took the wire off the sending unit and grounded it out and got no response from the guage. Checked continuity on the wires one the engine bay and under the dash they were reading 1.4ohms but it was fluctuating. Pulled the cluster out and found nothing out of the ordinary. Pulled both wires off the temp guage and hooked up a new guage and ran a single wire to the sending unit and connected it to the temp guage. Started the car and still had no movement on the new guage. Not sure where to go next. I wouldn't think it is the voltage regulator since the other gauges work normally.