Can '64 Dart Temp Gauge Be Adjusted?

The factorys' adjustments on the back of the gauge dont bend anything. They rotate the parts where they are braded to bottom of the can. You dont twist a screw driver blade in the slot to move them either. You push the part left or right as far as the little hole will allow.
I never tell anyone these adjustment are there because once moved you might never get close to right again. And that why dealerships service techs were not informed, or advised/instructed to adjust these gauges. If it doesn't respond correct to the 3 point tester... replace it, as stated in starting post.