90 Blazer S10 gauges disappear when headlights on

[tweston]

This is kind of a strange problem. The gauges are fine when the headlights are off, but when I turn on parking lights or headlights the gauges become so dim that I can barely see them at night, and can't see them at all in the day time. Of course I tried adjusting the dimmer, but it had no effect. I replaced the headlight switch because I had one handy, no joy. Speaking of which, does anybody happen to know where I could get one of those plastic dashboard pieces that the headlight switch mounts inside of?

[ericn1300]

Digital dash? try rotating the dimmer switch with the headlights on to turn them up again

[tweston]

I did try that, as I mentioned in my post. Any other ideas?