My cruise control on my 99 just recently stopped working (dash light will come on when i turn CC on, I will try to activate CC and the light will go out on its own a few seconds later) and in addition, while the car is still warming up, at idle, the revs will raise to about 1000, the gauge lights will dim, the radio will quickly cut out and then everything will be fine after (CC still doesnt work).
From
http://986forum.com/forums/performance-technical-chat/25251-light-flickering-dimming.html, it seems they might be related...would a bad ignition switch cause both of these?