Ben Jackson wrote:

I understand that if I had a CHT, and it had a redline (I don't have one
at all, probably because the PA-24 doesn't have cowl flaps) I would need
to keep my CHT or get something certified to be a primary CHT.

Are there any rules regarding EGT?

My aircraft has a list of mandatory (AKA "standard") equipment and a list of optional
equipment. If you can get the same lists for your aircraft, and if the EGT is not
listed as mandatory equipment, it can be removed.

George Patterson
This marriage is off to a shaky start. The groom just asked the band to
play "Your cheatin' heart", and the bride just requested "Don't come home
a'drinkin' with lovin' on your mind".