There's probably more suggestions in the Audio section where I found this one...

per rsmcmahon
Look for a possible point of passage through the firewall on the passenger side just behind main computer box. You will see many other wires running through the firewall at this point. I had a cell phone, hands free kit mounted with the wiring running through this area.


Or if you want to...
Instrument cluster removal
http://www.peachparts.com/shopforum/showthread.php?t=71691

Bob