"Calif Bill" wrote in message nk.net...
: Some tanks still read full for a ways towards empty. Pull the screws and
: remove the sender and cover the tank hole. Connect a ground wire to the
: sender. Metal part of the sender and the guage should move empty to full
: as you move the float.
: Bill
:
If the gauge stays at full deflection during the above test, check the ground
at the gauge. Normally, there're three wires - ign, send, grnd. When the
ground's undone, the needle will peg.
If I remember right, a high resistance end on the sender wire will make
a needle float too high, as well.

Dave