When you own a NT you really should invest in a pressure tester. They're pretty cheap.
To do it without, do the following:
Turn your HPR-adjuster way in. Turn it counterclockwise until it cycles correctly. You may want to remove any spacers doing this. You may also have to push the bolt back with your finger until it cycles correctly. It should now be at about 130psi. If you run it at over 150psi you should hear the solenoid venting.