There is a company (have seen ads), but cannot recall right off hand, but you can send complete cluster, and they will update, and restore to look like original, except amps. They will convert amps to volts, but you would have to look for it to know wasn't original. If you want to go this route, let me know, and I am sure I can find info on the company. I am sure not cheap, that is why I have not looked into it in depth for the 48 DeSoto.

Jack