Hello all. I am new to this forum so I hope I am doing this right. I have a 1986 Chevy k20 4x4 with a 350/auto and dual tanks. My fuel gauge shows "way" above full even if I switch to the 2nd tank which is almost empty. I got another instrument cluster thinking the gauge was bad but still have the same problem. Most people are saying a "wire" issue but where do I look for this wire issue? Thanks for any help.