So today I installed a serial adaptor that I bought from Mellon Racing. The instructions that came with serial adaptor talk about using the blue wire from the gauge to log. Well the analog gauge has a White Analog Output + wire and also it has a Brown Analog - wire. I wired the White wire to the blue wire on the adaptor from Mellon Racing, and grounded the brown wire.
Later when I was done I went over to Radio Shack and bought a serial cable (my laptop I use has a serial connection on the back). I follwed these instructions for my install... http://www.evoxforums.com/forums/showthread.php?t=21747
Here is a screen shot of what I have selected. Also I went into Device Manager and tried changing the Bits per Second to match what is shown in Evo scan as you can see whn the car idling my a/f always shows 0....

 

Found my answer on google.... analog gauge does not work with serial connections

 

Not meaning to beat a dead horse at all... but you said it right there. Analog != digital serial.

It really is a bit disappointing. I'd rather have the analog gauge, but the no serial logging is a deal breaker.

 

Your right I know I screwed up. So I guess now I am gonna wiring it into the rear o2 heater curcuit. However there is a new problem, the 2012 has different color wiring From what I can gather I need to wire into pin 3. Also I dont understand the mathmatical equation that needs done to the ecu