Sounds like you overload the dimmer circuit somehow by installing HID ballast or DEPO angel eyes.

The dimming is self sustaining (not part of LCM), the circuit is right there where the dial is. I tried to tap on one of the line for my angel-eyes relay (I like them on as parking light) and all the sudden my dashboard went dark. I untapped it and it backs to normal, dial work etc.

try to unhook the ballast and see if turning one click on the main switch will restore the dimming function.

BTW, where did you tap your DEPO angel eyes (DEPO comes with LED Orion style angel eyes).