1993 Jeep GC Limited - Overhead display is too dim to be useful - especially when headlights are on. Can this be adjusted, and how?

It's the dimmer switch....follow below:

Without Air Bag The ignition switch is located on the lower part of the steering column.

1. Place the ignition in the LOCK position
   

1. Remove any components necessary to access the switch.
   
2. Remove the two switch mounting screws.
   
3. Disconnect the switch from the rod.
   
4. Disconnect the wiring and remove the switch.
   

1. On non-tilt columns:
   
   1. Move the ignition switch slider to the OFF unlocked position (move the slider all the way down, then back two clicks). The remote rod hole in the ignition switch slider should now be centered.
      
   2. Insert the remote rod in the ignition switch slider hole and install the ignition switch on the steering column. Tighten the attaching screws to 35 inch lbs. (4 Nm).
      
2. On tilt columns:
   
   1. Insert the ignition key in the lock cylinder and turn the cylinder to the OFF unlocked position.
      
   2. Move the ignition switch downward to eliminate any slack and tighten the attaching screws to 35 inch lbs. (4 Nm).
      
3. Install any components removed for switch access.