http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92699
or
http://snipurl.com/pkjt

This is on sale at Harbor Freight tools until 5/14/06 for $7.99.  It comes
with a bunch of adapters and goes up to 100 psi with 1 psi increments.  The
manual says it has an error of 2%.  I haven't tried it yet, but it appears
to be of reasonable quality.  (Really impressive quality for that
price.)   The gauge has a thick rubber protector on it.

I'll report again when I hook it up to the van.

Edward