If the needle centers I wouldn't be so quick to replace it, the needle moving to Pos. when the switch is turned on sounds to me like the polarity of the system is reversed and the needle moving to full discharge when running could be indicating a proper charge but in reverse as far as the gage is concerned.
Some of them older Fords had a ammeter that the charge wire simply passed through a round loop on the back of the gage, if the wire is going through the loop in the wrong direction the polarity could be right but the meter still read backwards. If that is the case reversing the wire in the back of the gage may straighten it out.
If it is a "normal" gage the wires will be fastened directly to studs sticking out and if the battery is charged properly and hooked in correct polarity the gage can be reversed by simply moving the wires to the opposite studs.
Make sure the battery is properly charged as I have seen batteries charged backwards, Possible if the battery was COMPLETELY dead and the charger hooked up wrong.
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