Flicker flutter

Amp gauge is always above center for the most part
To use the ammeter, and actually also a voltmeter, for troubleshooting the observations need to made in conjunction with the situation. Change the situation and new readings need to be made. Both sets readings are valid and useful knowing what was going on at the time of each.

Not really sure what above center is, or what situation was happening at the time.
Do this for your own basedline.
if you want to get fancy, do it with a voltmeter where you can see it (cowl?) and clipped to read across the battery to ground.
1. Open the door/turn the interior lights on. The ammeter should show 2-4 amps discharge. The voltmeter probably won't show much change.
2. Turn on the headlights, note the gages shows.
3. Turn all the lights off, start the car. The meter should go slight discharge, then to charge. Is the needle bouncing? It shouldn't be, Is the engine on fast idle, if so note that. Let it charge for a few minutes. The need should go to zero.
4a. While running with the battery now charged, turn on the headlights. What's ammeter show? What's voltmeter doing.
4b. If its on slow idle, increase the rpm, Observe the readings as the rpm increases. Get it upto 1500 or 2000 rpm, nothing higher really needed.