Yes the cold junction compensation is worth having and should be standard on anything using a decent K type amp IC.
I would probably do as above and have an external unit... but I do agree that logging EGT via the ecu is sooo much easier when mapping than having the ball ache of different graphs in different programs all with different time stamps... I usually use a separate program for displaying logs of knock and fucking hate using more than one program on a single screen (laptop).
Better than all of this is a combustion pressure monitor... but they have their own quirks and demands. But the impact upon tuning ignition and monitoring det/missfire is out of this world.
Last edited by Rob_DOHC; 28-09-2015 at 10:51 PM.