I've mounted mine (mechanical gauge) with Tee on a block drain fitting, Tractionless placed his on the thermostat housing, and some day I will move mine to the stat housing to compare if there are any differences. Would provide difference in pressures with the SS and plastic, but when I went out for first time, I had a hose fitting a bit to loose, so need to take another run to compare

I have done same.All hoses checked and quick connector at transom new sealed.
Hope to get a test ride at the weekend.
Michael

Numbers for last couple days on plastic pump
Cold 6-7 psi idle
Once thermostat opens it goes to about 2

3600 to 3800 rpm 22-24 psi running about 160 degrees, have not tried WOT yet

From my oil temp thread I found my readings were
So if next season is the same as above, then there is no difference, but the initial looks good. Oh another point is this is my old pump housing which had just really light groves (enough to see, but not enough to catch a nail)

Sounds not good!!
My engine pcm is programmed to need 30psi minimum at Wot.
So all pressure under this over 4500 rpm reduce power.
No one wants this!!
I drive to holiday now with my 22 psi and look after it where i can find some more psi.
Maybe transom pick up or so!
Michael

So 10 years later and still the same problems.