Got this reply from a tuner about egts from tuning. Opinions needed.
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Mego is spot on. Different factors will contribute to different readings. When my car got chipped and Dynoed, the bloke told me what was already mentioned here. CRD's run hotted than Di's in stock form. He did mentioned why, something with higher fuel pressure... Can't remember exactly, he gave me a technical answer.
When I got my EGT gauge fitted, I sort of panicked when I seen the EGT's. Assuming my EGT gauge was out of whack, I plugged in my mates guage, including his bung all the way to exhaust and difference was 10-20C. I like to think mine is pretty accurate. Unless his and mine are stuffed. Which I highly doubt.
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