Mine idles around 15"  goes up to about  22" during de-acceleration,
but I'm getting my vacuum from the manifold, but shouldn't make any
difference.  If you run a line all the way up to the dash for a
permanent gauge like my VDO unit, I was told to use very small
plastic hose(like air shock plastic line size.  The thinking that
bigger piping will suck the engine dry of needed vacuum.

YMMV

DM&FS

At 05:24 PM 11/23/2011, greentabe-vanagon@yahoo.com wrote:
>Anyone know what normal vacuum at, say, idle and 2000 RPM should be
>for a 2.1 WBX in normal running condition?  I'm measuring off of the
>fuel pressure regulator port. Thanks! tabe johnson/90MV