That is a problem you have to try to repair dash first see if any plugs are not secure into dash also l believe there is a board underlay in the dash see if that is bad l believe key switch ignition controls the positive side of the light bulbs in the dash the check engine light l believe is controlled by the computer for ground. Check all fuses and wiring going to the bottom of dash if you do not address the dash problem you can not find this problem.