Bob,
Just installed the gauge and reflashed the PL, cool set up! I did notice one issue, when I cycled through the screens and got to the flags display the scmg shows the fan 'on' and the PLC shows it as 'off'. The actual fan was off, I didn't leave it idling long enough to get up to temp for the fans to come on though.
Also, the AEM 3.5 map displays vacuum a couple of inches lower on the scmg vs. the PLC.
Is there some overlap of black PLC boards that don't need the capacitor removed? I didn't remove it, is it necessary?