I personally prefer an ammeter in a Mopar, as it tells me if juice is flowing into or out of the battery. And how much current at any given moment.
I had a mid 70's pick-up with flickering ammeter syndrome. Drove it for years without a problem. It would peg the ammeter needle if the battery was low. The pulley bearing was getting loud so I swapped in a good used alternator with unknown amperage rating. The flickering went away. I don't know why it did and I'm not saying it is related to your issue.
Any weak connection in the charging system will 'confuse' the voltage regulator.
