I got a good one

Did you check the ground strap between the tank outlet nipple and the steel fuel line? The 2 steel parts complete the ground circuit. the steel lines are joined by a piece of neoprene to limit NVH between the tank and the line. I'll look for pictures. If the ground strap between the two is missing or corroded, the sending unit signal won't get to the fuel gauge in the dash. Hope this helps, it fixed mine after months of chasing my tail.