This is our 60/60 sweep Ammeter which is a replacement for the "D" series AC Tractors.  This is a direct replacement. Has Allis-Chalmers name. We recommend using this gauge when changing over to a 12V Conversion with Generators where maximum amperage is not over 45 amps. 
NOTE: Ammeters should never be used with Alternators! Read about this in our tech section. Makes for a good read!