New Sending unit
I bought a GM "universal" 90 ohm sender, if you have the analog dash, this will work, it worked for me:
1) Order the universal GM 90 ohm fuel level float from JC Whitney for $15.
2) Unscrew the original sending unit from the hanger.
3) Remove the new plastic unit from the new hanger and transferred it. The screw holes line up perfectly !
4) You have to bend the new float. You may need to tweak it to get empty & full to read correctly, make sure you verify how the your guage reads, I missed a little and now have a 4 gallon "reserve" when I am on "E".
Make sure you also get a new rubber O-ring and locking ring so you get a good seal, they are available at Autozone for $5.
This would be a good time to hotwire your fuel pump too.
This is an easy fix.
Good luck.
Bob