So I have a water pressure regulator that was in my boat and before I put it back in, I want to make sure it's right for my application. 1st Question would be: What water pressure should be aiming for? How much is too much? The regulator I have is adjustable from 25-75psi, but I have heard that 15-20psi is the max I should have. i had it set to 25 psi. Where should install gauge to read it? Just after the regulator or from the block?