Gas Gauge issues

[DoobieBrother]

Hello. New to the board. Just getting started on a `68 C10 handed down a couple of generations and needs a load of work.

Ok trying to fix the gas guage on this `68 C10. Father in law told me it needed a new float when I picked it up from him. I ordered one and this evening went about installing it. When I pulled out the old sending unit, all looked pristine including the little bag. I think maybe he already replaced it once. At any rate I decided to pull off the old float even though it looked fine. When I pulled it off I noticed it was heavy. So, I'm thinking ok, maybe it's waterlogged. Decided to put the new obviously light and hollow one on and just for curiosity sake float the old one in the sink. Old one sank except one corner held it up. Ok, maybe bad.

So, I put the new one in and reinstalled. Hit the key, and nothing. Well, here's what I noticed. Needle sits near "Empty" label. When you hit the key, though, it moves maybe a 1/16 inch or so further to the left (empty side). Unplug the sending unit wire from fuse box, hit the key and it goes all the way over to full+. Like 3 o'clock position. So, I'm trying to figure out...Bad sending unit? Maybe somehow positioned wrong? What?

Thoughts?