I posted this over at FSC, then at Thirdgen, and they suggested this site.
Here is the post from thirdgen.

I know a 94 350 tbi 4x4 is not a thirdgen, but I have searched through the past messages for days and have not found any related info. I have a wb02 that appears to read fine on the stand alone unit, from 12.5 at a cold start up to 14.5-14.9 at a warm idle. Truck runs fine. I'm trying to get this into my 7427 ecm data stream using tunerprort v5. From the controller to the b16 pin and following the guide from 93v8s10 over at FSC set all the codes/flags accordingly. But my tunerpro display only shows 10.0 - 10.1 afr and never goes any higher. I have verified the voltage going to the pin from the controller. Starts at about 1.32v=12.5afr and after it warms up it goes to about 2.4v=14.7. I think its in the software but not sure what setting to be looking at. Could really use some guidance.

stock 350 tbi
7427 ecm
prologger wbo2 setup with a 0-5v output