How many are using the factory amp meter

original ammeter on all my a-bodies.
Had headlight circuits fail or partially fail on three.
I would change the headlight circuit to turn on relays drawing from the alternator before worrying about the ammeter.

If you haven't increased the current loads and feel comfortable, then just check over the things that could cause high current draws. Grounds, Connections at the connectors - especially bulkhead, headlight connector, chafing spots on insulation (including at the headlight buckets).