Stop in for a cup of coffee

Icetech said

If it's reading but off that should be the sending unit itself... i use a spectra but no idea if it's accurate as i have only had like 2 gallons in my tank so far

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That's what I'm thinking. I haven't been driving it enough to see it cycle up and down. I bought a used tank at local yard and I think I ended up using the sender that came with that. Not certain if it was an original, or aftermarket. It worked pretty well over the full range when installed.