After trying to find stuff in the dark, I finally decided to install an interior light. I found a great deal on an unissued Canadian military map light on Ebay. I took out the heavy power cord they put on it, added a 12V pilot light and installed it under the dash:
I can finally see inside the Jeep when it's dark out! I only had to drill one small additional hole to mount it, so I kept changes to the dash to a minimum. I added a cigarette lighter and 12V power receptacle to the sides of the light unit and added a dropping resistor to the pilot light to keep it from burning out so often.