Because I moved my oil temp gauge to the motor, I had an extra hole in the dash so I bought a water pressure gauge, which doesn't regester and thing. I have a Weiand tunnel ram. I first plumbed it in the hole to the left side of the thermostat housing, nothing so I replumbed it to the right side of the housing, nothing. I have the 3/4 neovane pump. The water must flow with no back pressure