my gas guage will not show a full tank and i've pinpointed the problem to a bad ground at the guage bracket. if the guage is mounted in the bracket the needle shows less than a full tank. if i take it out of the bracket and ground the back of the guage with a jumper wire it will show the full tank (sender is out of the tank, so i know the needle should show full). i've sanded the inside of the bracket and back of the guage but still the ground connection doesn't seem to be good. so my question is whether anyone sees a problem with me soldering a piece of insulated wire to the back side (on that little grounding plate)of the guage and then running that to a good ground under the dash. i'm working on a 1950 3100, 12v with a new 12v guage and sender. thank you.

Che
1950 Chevy 3100