The serial port on the innovate wideband that I have is a mini phono jack (or maybe even the smaller ones that they use for cell phone headsets, I don't remember).
Normally, one wire would be data to the wideband, one would be from the wideband and the other would be ground. I just omitted the one that sends data to the wideband so that the garbage coming off the serial port of the empeg on boot wouldn't mess up the configuration of the sensor.
I can find out exactly which wire is which when I have a chance to pull the cable out of the car.
-Jeremy