Fuel gauge Question

[tucsonjwt]

I had the same problem on my 83. I replaced the sending units in both tanks and still had the problem. I replaced the gauge and problem was fixed. I used aftermarket Spectra brand sending units and the needle on the gas gauge will bounce around when the truck is in motion. I think AC Delco sending units would not do this but they cost about $150 each and the Spectra units were about $50 each. The Spectra units do display the correct fuel level when the truck is not moving, after the needle settles down.