In the meantime I have put a separate ground from the regulator to the chassis. The result is very positive; the bouncing needle has calmed down considerably. I still have some bouncing at low revs and the next step will be to buy a new connector plug (correct wording????) for the regulator in order to have good connections here, too.
If I have no success with that I will try out the "JFB-checking procedure"!
I`ll report!
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