hi guys

finally got my V8 gauge/log working with my E40 controller in my 05 ls2 Vette and reading all the stuff i need to street log my H/C/I setup.
What is a bit confusing to me is that the fast controller shows 14.5 AFR and the AD1 connected to my flashscan an laptop shows around 15.1 so the flasscan reads a tad more than half a point more than the WB controller.
The wideband is set on high resolution and the values in the formula are on the predefined values what would match the value that even the Wideband screen says. which value is now to trust or do i have to change the PID formula to different values

-- WO2A.AFR_F1
return pid("AD1")*2.78+9.6

any suggestions?
thanks,
pat