Instead of the traditional gauge route, I went with a Scangauge II. Very pleased; 4 gauges displayed, many options programmable. It took about 8 minutes to install. Plus many trip computer options and OBDII code display and reset capability. Initially I set it up to display water temp, boost/vacuum, ignition advance, and current trip MPG.
The Scangauge II looks like a nice option... I have the JCW gauges (Relative torque and engine temp) but I'll have to find a good mounting spot before going with the Scanguage.