Dash light issues

The dash lights are fed from a rheostat in the headlight switch.

I suspect you have a short somewhere in the dash light/radio light/gear selector light circuit.

The rheostat can take a short for some time till it melts and opens making the circuit dead.

Go get a wiring diagram from mymopar.com if they do t have your year look for the closest year.

And trace out the wires.

Disconnect all dash/radio/gear selector lights and see if the problem still exists. A test light might be helpfully.