I have yet see a shoebox that didn't need some massive rewiring, my '51 certainly did. After completely rewiring the car (with all new grounds), I found the dash lights still left a lot to be desired. Out of desperation I pulled the instrument cluster, took it apart and cleaned it. I removed all the metal covers over the light bulbs (see picture), painted everything inside the cluster white. I also changed the oil, temp, fuel, amp gauge needles and the speedometer pointer, from the factory dark red to white.
Result- My old eyes no longer need to strain to see what my car/engine was doing. Night driving is no longer an exercise into the world of partial blindness. For me it was well worth the effort!
Tom