I'm gonna start playing with Arduino making some sort of EGT display/datalogger. Looks like we need an EGT input shield. The probes put out very little voltage and don't act like a regular 5v sensor at all. Luckily there's EGT shields out there.
Single channel Dual channel Four channel Eight channel
Seems as though the 8 channel can only do one every .125 seconds, so you can only read every sensor once a second on an 8 channel unit.
Ocean controls has one too:
https://oceancontrols.com.au/KTA-259.html
Looks neat but doesn't correct for non-linearity. That would have to be done with the code.
I'd like to start off with a simple multi line text display like this:
Standard LCD 20x4 + extras [white on blue] ID: 198 - $17.95 : Adafruit Industries, Unique fun DIY electronics and kits
Then eventually move to touchscreen and logging.