Bypass ampmeter through bulkhead

Thanks for the reply.
As it is. The ampmeter is in good shape after 50 years or so.
The posts are still solid and clean.
So I would assume that the melting of the bulkhead connector may not have been caused by the ampmeter. But from another source.
Possibly from the connections, in particular the charge wire from the alternator, inside the multiple connector in the wiring harness on the passenger side in the engine bay. There was noticed a scorched connection there.