Hey guys, I have a 2004 Stratos 285 Magnum with a 175 HP Johnson Bombardier V6 2-Stroke...My water pressure gauge stays on 5 psi all the time until I give it throttle then it works fine, but even with the motor off it still sets on 5 psi...Do you think i need a new gauge?...If so, are they hard to change out?.....Sorry for no serial #, if I need one I will post tomorrow....thanks