Got everything installed in my Mustang with A9L, using the Quarterhorse and BE/EA. Trying to get the PLX device that's tapped in to the egr pin on my ecu to display. In BE, I clicked on the hardware tab, then checked the box to enable the PLX. What do I need to actually enter into the config area for it to accurately read the wideband AFR?

you need to click on the transfer tab right there in the hardware config and put in the actual transfer function for your wideband

i typically do something like this

16 = 19
4.8 = 19
2.5 = 14.64
.15 = 10
0 = 10

something along those lines, depends on the transfer of the wideband your using and how you have it setup to output voltage