[Lambda Reading off set by Exhaust pressure]

Not sure if this will help too much, but each lambda sensor has it's own pressure curve. There is some reading here that may help. Basically, you need to get the curve for your particular sensor to make a compensation map.

[Link ECU/PCLink CANBUS abilities]

I'm fairly set on getting a link g4x xtremex for my harley project. There's a few things that will sway me one way or the other. One of those items is a built in canbus logger, does PCLink have that capability? I plan on integrating into the stock canbus system vs setting up a completely new one. Tach/Speedo, indicator lights, fuel gauge, etc all are run from the existing canbus system onboard. I have a stock ECU that I would like to monitor as I put the system into various states to read the messages to emulate them. I presume the majority of the system is the BCM reading messages from the ECU for engine parameters and the BCM sending messages to the gauges/indicators and the ECU.