Okay. Had some more time this morning, so here's the Wideband. I went with the Innovate Motorsports DB-Gauge/LC-1 Kit from Specialty Z as seen here: [ http://specialtyz.com/wideband.htm ] I chose this unit because I wanted a gauge that would somewhat match the DEFI Display blue readout. I also wanted a gauge that goes black when not in use (for appearance and stealth).Removed the knock-out plate on the right side of steering wheel:
 
Drilled a hole in the plate where I could barely thread the gauge through the plate for a tight fit. Also put a piece of 4mm Vacuum Hose on the upper stud to conceal it:
 Drilled a hole in the plate for the wires to pass through. Also put a lock nut on the back of the gauge stud:
 
The gauge mounted (with a lot of fingerprint smudges):
 Some more photos of the mounted gauge:
 

Here's where the cord comes up from the Test Pipe, through the fender, and through the firewall:
 
The cord travelling up from the Test Pipe:
 The Sensor mounted in the Test Pipe:

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