Hmm, clock is actually on the other side of the dash from the tach. The knob to the left of the tach cycles through the various computer displays and adjusts the brightness of the display. Haven't been able to get it to do any thing more than that. Here's a link to a pic of the insturment panel that I'm working with.
http://www.igdc.com/ejfluhr/audi/Pics/Digdashs.jpg
The clock is located behind the stearing wheel in this pic, below the coolent and fuel gauges.
Thanks again for any help, someone out there has to know this!!