Hi, the 72 Nova of my girlfriend has a fuel gauge that always shows "full"...wouldn´t be bad, but that´s even with ignition of or battery disconnected. Gas-Tank is filled 1/4 at maximum right now. I removed the instrument from the dash cluster. I can move the indicator by hand in both directions with the same effort. New instruments I found on the net always show empty. How "hard" it is to move the indicator, will the gauge show "empty" when out of electricity? I tried to clean it in an ultrasonic bath (do you say so?) with the hope that maybe hardened grease made the instrument not work properly. When I connect it to a battery directly, indicator moves to full or empty, depending on which terminals I put (+) and (-).