SAAB dash wiring

The dash and front panel lights on my Saab 900s 1995 are either completely off or dim as I drive. The radio light and the mileage light dim only when I hit the accelerator. The car has 108200 miles on it as of today. No issues with starting or stalling but my radio does have horrible signal. The check engine and abs lights are on but I got those checked with a mechanic who said it was non-issue unrelated to the engine. What could it be I am fairly worried.