Erratic Gauges

Okay, so an update:

taking the ground off at the wiper switch didn’t change anything.

I did find out that if I ground the wire ends the gauges will go to peg, but then oil and temp gauges will go back to their bouncing thing.

I did take the negative post of the temp gauge and grounded it. The gauge went to peg but then started to bounce again. So that tells me that what ever the issue is before the gauge...

Any thoughts?