Honestly, I've never looked into installing a EGT gauge as an input to the ECU, but, all you'd need to do is find an EGT that has a 0-5v output and run it into the aux. input. You could use this to richen up the fuel mixture if EGT's got above a certain point, etc. I obviously recommend using an EGT gauge for tuning none-the-less, that just requires a simple EGT gauge set.
Maybe someday, we'll see, funny thing is, this whole product started out as "What if we could accurately fuel and time a motor using degree based instead of event based processing", but it never ends I suppose.