The fuel tank is full except for 25 miles driven off of full tank 3-4 gal. (80 Gal fuel tank) Stepper Motor is the small electronic motor that drives almost all of the gauges in the instrument panel. Maybe 2" in diameter or a little smaller and they can be replaced by soldering. They convert the signals from the sensors to drive the needle on the gauge. My oil pressure sensor is good as checked by direct pressure gauge. So my gauge eratic problem is due to a bad stepper motor in insrument panel that drives gauge. Easier than replacing whole panel.
