ALT gauge issues- clicks and pulses 69 DART. NEED HELP!!!

Due to todays www, and madelectrical, and more, owners are instructed to drill through those terminal ports and shove a wire clear through. Before all that,
The auto service garage would put new terminals on the wires and relocate/secure them into previously unused ports.
In some cases there would be add on equipment, fog lamps, stereo, whatever, that drawed too much current through these terminals and the same failure could reoccur. In many cases their simple straight forward repair was good for another 25 years.
Low voltage can cause all sorts of strange issues in anything electrical. Did these weak connections cause the click/twitch in the ALT' gauge? Time will tell. Good luck with it.