JUMPING AMP METER -- Me Again

Amp Meter Jumping and Lights Flickering - 65 Valiant -- This is still happening in spite of all that has been done, in the other post -- What are the potential problems, if I just consider it a Day Time Car, -- lights off, and ignore the jumping amp meter ? -- Ruin something ? -- Fire ? -- Other ? -- The alternator was tested as OK, by a rebuild shop, and the battery charges correctly.