I need some fuel sending unit experts please

Murray said

Random thoughts. The IVR in the gas gauge may be behaving inconsistently. Have you confirmed that the gauge cluster is grounded to the body? You may have two problems, fuel sending unit (chinesium) and temp sender ( taped threads?) I tend to think that your new fuel sender is bad because you can ground the sender wire and the gauge works.

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I’m not sure about the grounding to the gauge cluster but I assume it is, because instrument lights work and temp gauge works. There is a large ground wire on the steering column and I understood the dash grounds through the mounting hardware. The fuel sender is brand new from classic industries. I bench tested it before I installed it. The old one I removed had been installed in the new tank about 10 years ago and has was only recently run through it. It tested the correct resistance after removal.