1967 Firebird. I need some help and advice to make sure my temp light is working properly. When I turn the key to the on position, the oil and gen light both come on. The temp light does not. I grounded the green wire to batt ground and the light comes on with the key in the on position. It does not seem that the car is overheating but I would like to make sure the sensor is working. First, should the temp light come on when I have the key in the on position like the oil and gen light. Second, I did put in a new temp sensor when we rebuilt the engine. However, I would like to test the sensor to make sure it is working since the light does not come on when I have the key on and the only time it should come on when the car is running is if the engine overheats. I know I should probably look at replacing the oil and temp lights with gauges but I am trying to keep the car original since it is pretty much unmolested other than the engine that we rebuilt.

In addition, when the car is running the dash and gage lights, interior lights, headlights, taillights all flicker a bit. I did put a new alternator on the car when I rebuilt it. I bought the alternator from alternatorparts.com. It is a rebuilt 10NDN case but is upgraded to a 140 A rating with 50 A stators. I have also checked all of the ground straps on the engine, frame, body, grounding under the dash, and have a good ground from the battory right to the fender just like the factory. My Ohm meter shows good continuity in all locations when I run a wire from Batt ground to unpainted and unrusted surfaces on the dash, firewall, engine, frame, body, ect.

Any suggestions you have on these issues would be much appreciated. Thanks

Ron