70 Swinger Rally Dash Lights Dim
I had the same issue. I think the dash lighting was just poorly designed.
I did the LED strip lighting upgrade. The gauges are actually visible now while driving in the city at night.
I did several posts in this thread on the lighting the cluster, but you can check post 57 and 61 for the results:
Rewiring my EFI Magnum - 1970 Dart Swinger