water pressure 250 Yamaha 4 stroke

How much water pressure should a 250 register on the pressure gauge. At idle and different rpm's.

idle 3 to 4 sometimes less wot 15 to 20 it doesn't build pressure like 2 strokes it more about volume the [censored] hole pressure is not very strong gauges are a crapshoot after they have been in north tex water for a while.

Did a little research on the water pressure gauge. It says it works off of air pressure. Is there something that will a malfunction causing water to make it to the gauge....

The later models don't have water to the pressure gauge. They have an electric pressure sensor paired with the gauge.