The fuel pressure regulator is inside the plenum and does NOT have a vacuum line connected to it. The port on the regulator is exposed to manifold absolute pressure and doesn't need a vacuum line.
Key on, engine off, pump running, pressure must be 60psi to 66psi and remain above 55psi for 3 to 5 minutes after the pump shuts off. Pressure dropping to zero, as mentioned above, is most likely the check valve in the fuel pump. The only way to tell for certain is to connect the pressure tester directly to the pressure line at the fuel filter. Activate the fuel pump and pressure should be 73psi to 108psi and must remain above 55psi, (probably be closer to 70psi) for 3 to 5 minutes after the pump shuts off.