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.
well if you need to replace it, spectra has the best reviews/reputation... just keep your old lock ring, supposedly the new ones are thinner (i have a old and new but didn't measure them to verify)