If you have a regulator with a return line. The fuel line comes in one side and goes out the other side, and the return line goes out the bottom, with adjustment on top. The pressure guage would mount on the visible side, with mount for pressure regulator on back side. Tracker fuel pumps can go at least up to 90 psi deadheaded which was where the pressure regulator was set. There was a vacuum line fitting on the one I installed, and it is connected to a vacuum port on motor after initial setting w/o it.