I thought about grafting in a gage pod somehow, but the only things I am missing from stock is a voltmeter and clock. The clock is handled by my head unit, and for the voltmeter I got this to replace the fasten seat belt light:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=350084717917
I also have aftermarket A/C with the knob on the console, but I am moving it to the cigarette lighter slot with a longer knob I made