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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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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