Very common on C5s and earlier Vettes...I have done the rec'd Techron addition dozens of times to no avail. (The Techron relieves some/most of the corrosion on the sender/sender arm for some people; not me.)

The parts are ~$500 last I checked, and it's 3+ hours of labor, plus a re-scan of some kind. So, pushing a fooking grand, and a DIY on a gas tank ain't in my wheelhouse...the downside is the new part may last years or just a year or so, from pages of threads on this issue. So, I just let it be like it is, for the past several years.

We made out fine on our 13k mile trip, and I only ran out of gas once.

Thanks for the kind words.
GL, mD