Today I tried an AutoMeter mechanical gauge, which read a few psi higher, about 26psi idle hot.
These first 4 pics are of my very first, engine break in, on the dyno oil filter. Very small metallic particles, which I don't think is out of the question, just break in material.
These 3 pics are the second filter where I was doing all the revs in my videos, and a little bit idle and run time. maybe about an hour of run time. Much more clean, nothing of concern I would think?
Those little metallic particles are really small, very fine, could still be residual break in material. I dunno, I've seen hellova lot worse. LOL
Bottom of filter was very clean...
Here is a video I did today of the AutoMeter gauge, warmed up, and some revs.