I've been researching this for days and hoping to find help.
On the Accessport there is an option to monitor WB AF data. I have a bung waiting on my down pipe for a WB but I don't want the physical gauge cluttering my dash. (Say what you want about that, it's beside the point).
Just wondering if I can wire the actual gauge using that yellow wire trick, or if it has to be a wire coming off of the gauge.

 

I've looked into this as well and I think what you need other than another O2 on your exhaust is this unit:
http://www.innovatemotorsports.com/products/lc1.php

 

Thank you sir. I hadn't seen that. It seems like it would work, but then to find out how to correctly wire the analog out(s) and the power. I know AccessTuner will allow you to disable the rear O2 function (which I suppose is making the computer forget about the rear O2), but then will the ECU still see voltage coming from the read O2 wire for the Accessport to see it? And if so you'd have to find out what voltages the Accessport is assigning to a given AFR and calibrate the LC-2 accordingly. I suppose I'll try and contact COBB for that information. I asked Adam at COBB about how to utilize the WB function in the Accessport yesterday and he said he's going to find out and get back to me, so hopefully I hear back from him soon. But if there's anyone here that is familiar with the installation and can offer some instruction, I'd appreciate it.

 

If Cobb finds an easier solution then please share it.

Other than going through the installation instructions that are located at the bottom of the link I gave you (which I have not read) then I wouldn't be able to answer your question.

I've just looked into this issue myself and from what I've read and been told this is really the easiest way to go with this setup. I have an AP V3 as well and I don't want extra gauges. I would rather just use the AP for multiple gauges and leave it at that.

 

Did some tinkering around today at the shop and I did finally happen to find a diagram of the connection between the stock rear O2 and the ECM.
(Excuse the filter. Made the text stand out a bit better)

I suppose I'll order that LC-2 and make an attempt at wiring it how I think and see how it turns out. If it's programmable, it doesn't much matter what COBB's formula is because one would just change the LC-2 output to match it. Hopefully in the meantime I hear back from COBB or somebody here chimes in with a better (more confident) answer than I'm workin with, heh.

 

Is anyone familiar with this? Can I wire the WBo2 sensor right to the harness where the stock o2 was, heater wires and all, using this diagram?