It is "rear fuel pressure" and there is a conversion formula for it and many of the PID's like TIP to boost etc. The one I still haven't figured out is MCT which is certainly the most important "Temp" reading. I will post a link to the formulas that I got from Torrie later this AM. I will also post a link that Torrie sent me for you to download LiveLink 6.5, which is an earlier version of this software that has formulas calculated for the info we like to log. Only issue with it is that it can be glitchy and sometimes doesn't re-start without hassles. That's a big deal when you are turning vehicle on and off at the strip while working your way to the lights.
I was contacted by the person at SCT who trouble shoots their software, so if any of you have pertinent questions that the SCT software programmer can answer, let me know and I'll try to get you the info. My issue with the newest LL was that it would not log analog inputs, which I need for A/F in my G8, as I had to add an Innovate Wide Band to get that info. GM doesn't provide that output thru OBDII. This is a software glitch.