Delco,my VT 6 had the same issues with the fuel guage...i left it like that for 3 years until it stayed empty all the time and finally replaced the sender in the tank.
No wonder it woudnt work anymore as the tracks on the card had worn a groove and the contacts had worn away.
1 hour later and job done.....i cant understand why i didnt do it sooner

it was russian roulette as i do 800+kms a week.