Hi Chris,
On the AHOOGA Model A Forum, if you do a search under Africa, through the years, as far back as 1998, I remember a gentleman from South Africa with a 1930 Tudor named Brian Noik, Tel:082-416-9584; & another Model A owner was D.J. Voyce from Johannesburg, w/Out Of Africa A's; both of whom had Model A's & used to post a few messages during the 1990's.
Also, years ago, when insulated ammeter rear nuts were difficult to get, many Model A owners connected ammeter wires with regular brass or steel nuts.
Then they provided cloth tape to insulate the entire recessed area of the gas tank behind the dash panel to avoid electrical sparks from un-insulated electrical connections during or after dash panel installation.
Maybe best to contact Bert's or watch e-bay to try to obtain an "original" ammeter.
In my opinion, the new ammeters sold by Model A vendor's from China, (up until about 2-3 years ago), are of very poor quality & fit very loosely in the dash panel.
Just hope this helps.