Erratic EGT's w Strobes on

I have AeroLED strobes and when they are on the EGT indications on my Garmin G3X are dancing all over the place.

Where should I start looking for the culprit?

If it's RF noise, you might try snapping these ferrite cores on the EGT wires, maybe the strobe wires, power feed to the EFIS etc.

https://www.amazon.com/eBoot-Pieces...0467&sr=8-1-spons&keywords=ferrite+core&psc=1

I fixed a wacky fuel pressure/EGT indication when I transmit on certain comm channels with them.
Other thoughts, if able, as a test run the strobes or the EFIS from a separate 12 V battery and see if you can isolate it.
You may also try installing a capacitor on the power feed to the strobes and/or the EFIS.
Good luck, Tim Andres