Hello my father and I own a repair facility and used car lot. about a week ago I had a 91 sedan deville come in with a digital read out problem. The check engine gauges work but the Speedo, fuel gauge, and climate control don't illuminate. While testing with a test like the radio started making a loud current noise and the running lights flicker. I replaced the cluster panel and still nothing. Would the dimmer switch be the cause or the computer. Please if you have any ideas I've got a migraine over this thing. Help!!!