Gas Gauge

matthon said

67 Barracuda, gas gauge does not work.
Questions:
How can I test the gauge and sending unit?
If both work, how can I bypass the existing wiring in order to wire it myself?
A new harness is out of the question at this point and playing the 'how much is in my tank' guessing game is eventually going to leave me on the side of the road.

Click to expand...

Saying it's only the gag gauge that's not working...

First I'd test the gauge and see if it's coming from the sender or its the faulty gauge. Disconnect the wire off the sender and once done the gauge should be at Empty still, then ground the wire to a nice clean grounded part of the car, and make sure its a nice clean part because I did it once and didn't work then tried a part where there wasn't much rust on just metal and it worked, the gauge should go all the way up passing Full.

If the gauge worked then there are great chances of having a bad sender, those are easy to take out and check. If it's the gauge that ain't working then you either have a problem with the gauge itself or the wire running up to the gauge may be cut by maybe a rat lol

But my guess is that if only your gas gauge ain't working but your temperature gauge is, then its probably not the voltage regulator on the back of the cluster and probably not your gauge as well, I place my bet on your sender. Hope this helps!