Lucas 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 is an original NOS rare 80-amp gauge, correct for Jensen Interceptor and certain Aston Martins, as well as other high quality cars with high-output alternators. It will work with any car that has a generator or alternator whose output does not exceed 80 amps. It requires the standard 2-inch (52 mm) hole for mounting.
It comes with its original Lucas box.
NOT FOR USE WITH ALTERNATORS OF GREATER THAN 60 AMPS!