Dead Fuel Guage 91 20v

[Steve Sherman]

This AM the low fuel warning came on when I started the car.  Odd
because I had 1/2 tank the nite before.  Drove to a gas station and
filled it with 8 gals.  So it is the gauge or wiring or the sender.
FWIW, this gauge used to read about 1/4 tank high (eg at 1/2 full read 3/4).

I would be interested in hearing any other stories like this, and what
the most likely places to look at first are.  Also anyone know what
value resistors to try and simulate the sender.

TIA