So I have HPTuners std, that I have built the channel in using the egr sensor input, and it works but the issue i am having is that at idle or cruse the guage and HPT match almost perfectly but as soon as i start to give it throttle the gauge will show (for example) 10.8 afr but HPT will show 12.2. I have tried altering the voltage portion of the math parameter for the compensation of voltage and any thing other than what i have set originally really doesnt match between the two.

Or can someone tell me how to link the serial to usb from the lc-2 to hpt