welll I'm pro ammeter gauge guy... When you undertand how it works, what it means on how to keep safe your charging network, won't get worried anyore about the ammeter ghost fears

but, if you want... on a quick search, found this:

https://board.moparts.org/ubbthreads/ubbthreads.php/topics/783474/voltmeter-mod-for-mopars.html

I haven't read it really, but on a quick overview checked they mention about the sunpro voltimeter gauge which uses to be the one used on the conversion