aside that, well your late B body is a shunted charging system so you have less to worry about the ammeter ghostes and fears LOL

another thread

https://www.forbbodiesonly.com/moparforum/threads/amp-meter-to-volt-meter-conversion.40423/

This are replacing the full load ammeters, where the hosuing and PCB are diff from the shunted kind. on the shunted kind will need to isolate from PCB ( if pressent ) and not just the housing