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I don't have gauges which I am dumb for not getting but a modded my airbox and intake horn and straight piped my exhaust will my egts be ok to run the programmer
if your ailfilter stays clean, your egts wont be that bad. u will probably end up limping the transmission first before hurting anything with scorching egt's on a WOT run.
If you do tow, keep it on the tow setting and u will be alright.
That's how I run my duramax. No issues after 20,000 miles this year running it on tow with no gauges or modified exhaust/intake yet. I am installing gauges very soon, exhaust will be next.