""What is the rate of fluctuation of the ammeter?""

The ammeter needle moves fast from one side to the other. It is constantly moving fast and it slows down as the rpms come up into the mid teens.
It does not match a turn signal pattern, it just fluctuates thru about 70% of the ammeter range, quickly.
I will turn on the turn signals and the emergency flashers to see how they act. All of the dash gauges work and act normal.

Thanks for your response