Yes, but be careful with a full tank !  that is a lot of weight.  may be
your only option, though so use blocks, jack or something below for safety.
David is correct, its probably not your gauge.  most likely is electrical
contacts between the two parts.  I recommend cleaning every electrical
contact you can get your hands on, it will make a world of difference.  use
lots of dielectric grease, too.

I moved the ground lug for the tank sender on mine to a spot I could
maintain better.

--
Alan Felder
Austin TX
82 Diesel Westy