[Hozer 88GTConv]

Personally, I don't have a problem with the mechanical portion of the Ford unit. The electrical connector is what is a pos.
When you drop the tank, check the wiring and manipulate the mechanical arm of the unit with Key on-Engine off (obviously) and see if the gauge works.
Make sure you do this well away from the tank itself and any fuel vapor in a well-ventilated area.
This is a good thing to do to ensure you found the problem before you go to the trouble of reinstalling everything just to find out you didn't fix the problem.
Again, since I rebuilt the two-wire electrical connector and shrink-wrapped it, I haven't had any probs.
Good Luck.