Perhaps that tool will work.
it's not the same as a vacuum gauge though.
The carb flow gauge - I have one I used on a Porsche 914-6 ( 6 individual
throttle plates and intake manifolds ) ...that tool  measures flow above the
throttle plate.

a vacuum gauge measures vacuum developed between the throttle plate and
intake valves.
If the poster will say what he's trying to diagnose, or what the symptom is
..and what non-vanagon the car is,
we can better offer suggestions to help.
Scott

----- Original Message -----
From: "Richard A Jones" <Jones@COLORADO.EDU>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, August 22, 2009 1:46 PM
Subject: Re: Friday question.Re: Vacuum gauge NVC

>> I am trying to diagnose a flat four
>> with four venturis and individual intake manifolds. When I  attach the
>> vacuum gauge under a single venturi it produces rapid swings from zero to
>> 20.
>
> Hmmmm....  Maybe this is a 356?  ;-)
>
> I have a Synchrometer, a German flow meter for measuring just
> that.  I used to use it on my 911T when it had Weber carbs, and
> when I had a 911T.  As I recall, since all the air down a venturus (?)
> passes through this devicve, it tends to smooth it out.  You are
> sure welcome to borrow it, if you wish.
>
> PS: the scale on it runs 0-30 kg/h, with most of the scale 0-20.
>
> Richard