If your sending unit is bad it will only indicate full when you ground the hot lead on top of the sender. If the gauge is stuck at full it is probablt the GAUGE not the sender. I just went through this entire process including replacing and testing all the aformentioned. The sender is much easier to replace than the gauge which requires taking the dash partially apart. The gauge runs around $20 and the sender around $100 depending on length and there are different sizes depending on your year. Good luck
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Larry & Hedy Brachfeld
2003 Double Slide, Detroit 60
Coach # 646
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