You found the right one. It is going to come preset for European carb pressure which is the 3-4 psi range.
It is stating the range in which you can adjust it is 1 to 4 psi.
Just hook it up. Pressure the system and check it. Should be right at 3 with one pump 4 with 2 pumps.
You can run the Webers up to 4.5 or so with no issues. That is usually what the pressure gauge will show as soon as you shut the hot engine off. The fuel pressure rises because of the heat sink effect through the engine, into the manifold and up through the carbs.
I would recommend highly though changing out the original needle and seat to the Gene Berg glass ball needle and seat. Those are good for over 10 psi so they add a needed safety margin.
They also virtually eliminate the peculating of fuel and carb fuel boil over this set up is notorious for on a hot engine that has just been shut off.
They are not cheap though. $20 each last time I bought them.
This is a better shot of the regulator installed.
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