Indeed, the subject of the original post appears to have been a fixed pitch prop, as such there is rarely a MP gauge, or really that much need for one. What is your point?
Static RPM is meaningful as a measure of engine output ONLY if you have a fixed pitch prop. I was pondering the manifestation of the same problem with a CS prop due to personal interest (being as I tend to fly behind CS props). Big Pistons Forever provided a suggestion, which to be honest, doesn't make sense (to me). As far as I can see, there is no way of objectively observing the power output when a wobbly prop is fitted. Perhaps someone knows better.
I don't think it's terribly off-topic for the thread.