In that case I won't bother with a mechanical gauge. I noticed you had made a few references to heat build-up on the pistons with much too much pressure, and high EGTs with not enough pressure. I found this very interesting and was hoping that you could expand on this. This could help explain why a dyno service you know had noticed some very high EGT readings on one of his sleds without failure, and I mean temperatures I could not post as they would not be believable.
I was trying say that a higher egt from leaner jetting would raise hp and raise pipe pressure.
Higher barometric pressure from lower altitude or colder air will raise pipe pressure
Think I figured out exactly what happens that will burn an engine down with to much pipe pressure this morning.
On a long pull your egt in the center of the pipe will go up, the longer you hold it wide open it just keeps going up.
I have left and right egt probes in the y-pipe and another in the belly of the pipe, 1200 on the cylinders will be maybe
550 to 600 max in the pipe belly if I'm remembering right, and it takes a while to get the pipe heated.
So lets say you get 200 degrees more than normal belly temp racing your buddys across a 4 mile lake. The way a
pipe works is positive and negative wave action that pushes and pulls in your pipe sometimes even pulls the reeds
open and sucks all the way to the air box. The reflected wave from the tapered end of the pipe pushes mixture from the front end of the pipe and y-pipe back into the cylinder. If the pipe gets to hot it will heat this mixture up to the point where it will detonate real easy when its back in the cylinder.
There is a great 2-stroke demo that shows how this wave action works with simulated colored waves through the carb
engine and pipe, will try to find it and post a link, far easier to understand with it.