So the other night, I turn the headlights on. I have a '68 SS/RS. The left and right turn signal indicators both light up solid green and the fuel guage drops to empty. If I turn down the dash lights, the arrows and the panel go dark and the fuel guage comes back up to where it belongs (half tank). Turn signals work fine, and hazard lights too. Anyone ever had this happen?

Basd inst cluster ground. Rheostat is working fine.

X2 on the ground