What i did is took the original Fuel pressure Regulator out, then i removed the green 'O' ring, and then put the original Fuel pressure Regulator back together, minus the 'O' ring, of course.
i then removed the fuel return pipe attached to the fuel rail underneath the original Fuel pressure Regulator and attached a small section of the pipe that i got with the kit to the fuel rail and the inlet of the Aftermarket Fuel pressure Regulator. i then attached the return pipe to the outlet. i then attached the vaccum pipe from the original to the Aftermarket.
*Note: The Only Purpose of an 'O' Ring is to Create an Gas tight or Water tight Seal, Without an 'O' there is no resistance, thus no pressure