New owner of a '08 zx 225. At idle, I have a reading of 0psi for water pressure. At 4000 rpm trimmed 75%, I have about 8psi. I am running a 25 Fury. Does all these motors and guages read 0 at idle. 8 at 4000 rmp seems kind of low also... Sorry, but dont know my prop shaft to pad measurement...