Fair enough, I looked into the calibration within the help section of the FAST XFI. Seems kind of straight forward. I need to take a raw voltage reading at what would be zero PSI and then one with pressure. Obviously to do this I need a manual guage. Read raw voltage at both pressure settings. It's not quite that simple but I think I get the ghist.
Now to get this EGT system going, it's been over two months since I looked at it. Hopefully it will be just as simple.