I have the 0-160 version, and have tested with a 46fx. I don't know if I had the throttle open. I only given it one quick try so far.

If I flip the prop by hand 15-20 times I get about 40 psi, as I recall.

If I give it a blip with the starter, I get 110 psi.

That is a much bigger difference than I expected, I don't quite understand it, and dont' know which end of the spectrum is accurate.

In another thread there were reports of 80-90 psi as a good number, so I really don't know what to conclude.

I think you need to develop your own technique an stick with it. Then use the number for comparison only, as mentioned by wy8e.