SMITHS ammeters in classic British cars were usually rated at 30 amps, fine for the original generator, but in case you have upgraded to an alternator, you'll need one that can handle the extra amperage.
This one is made by Caerbont, the successor to the SMITHS company, on original factory tooling in the same shop that the old company occupied. It comes complete with mounting bracket and light.
NOT FOR USE WITH ALTERNATORS OF GREATER THAN 60 AMPS!