I have a chrysler new yorker turbo 87. The gas gauge and speedometer won't light up... I changed the fuses but nothing happened. The odometer, which is on the dash as well, lights up, but nothing else. Is it wiring? Do I need to replace the whole electrical system in the dash? Is there an easy way to fix this or is there maybe a wire loose?

Optional Information:
1987 Chrysler new yorker turbo

Already Tried:
changing fuses