Reply to "Wiring the fuel guage!"

Not sure about any GT5 differences, but in earlier Panteras the yellow wire would be for the low fuel LIGHT which your gauge may not have, so it's often an unused wire. Obviously your wiring is generally correct. Assuming your gauge is a stock Veglia gauge, you would need to bend the float arm UP to get it to leave "Full" quicker and eventually arrive at "Empty." Be careful if you do so to ensure no binding on the arm throughout the full range of motion, given the shape of the tank. If it's instead an aftermarket gauge, you may need to add some resistors in the sending wire. You can also use a temporary potentiometer in line to help determine the amount of resistors needed regardless, if you wish to avoid the bending. Stock sender should be a range of about 0-200 Ohms. Late-model aftermarket gauges often have a range of more like 240-40 Ohms but would also read backwards, not your particular issue.

And if anything, I believe you need to SHORTEN the arm slightly, as from what you described your range is now more like 24 gallons (from about 29 on the upside including about 8 extra that don't really exist, down to about 5 on the downside). But tank capacity is about 21 gallons.

Lee