Hey, I'm not on here much anymore since my R died last December and I've been driving an 08 Subaru Legacy GT, but I thought you guys would be interested in my little project since it's fairly universal except for the actual placement/execution in the car.
My project ramblings are here:
http://legacygt.com/forums/showthread.php/my-diy-digital-boost-gauge-clock-ii-project-205970.html
Anyone else here done something similar? Should be able to adapt it to read wideband and other 5v analog sensors.