Amp meter fluctuation?

You might not have much of a problem depending on how severe the fluctuation is. With a electronic regulator the amp gauge should be pretty steady. You need to test the system to make sure all is operating properly. 67Dart273 is very knowledgeable and he can get your charging system up to snuff. Old components, wiring, and connectors can cause problems for sure. Old technology doesn't help either. Do some checks and fixes and you'll be good to go. I should have looked closer at your name. 74 slant 6 cars should have electronics. My bad! LOL tmm