2021 150SS water pressure

[Ramblinman]

What range should this motor be running for water pressure at WOT?

[briscoe]

Unless I'm mistaken they all run around 10 PSI. They have a pressure relief valve that opens and releases excess pressure downstream where it release to exhaust. It's a great idea to take the pitot tube off the lower unit and use that hose to carry water pressure to a analog gauge. I constantly watch my water pressure, it's your engines blood pressure.
Briscoe

[Ramblinman]

Thanks Briscoe!