Al wrote:

Now that its cold again, my vacuum pressure gauge is acting up (again). In
the past, when it was cold, it would take a few minutes to come up to the
correct reading. Now, it takes about 30 to 40 minutes to come up. All
dials are OK, and when the gauge comes up, it reads in the normal range.

Any suggestions or good shops??? Thanks!

Alex
awaddell .a.t. codestrike d-o-t com


They use a tiny orfice (jewller's screw driver adjustable, located
thru the NPT threaded fitting on the rear of the gauge) to create
the damping for the needle. If this orfice is too big, the needle
vibrates in step with each intake stroke. If the orfice is too small,
it will do what you describe, especially in cold weather, where
differential expandation (sp?) of the materials tend to close up the
orfice...

The orfice adjusting screw is reachable by removing the 1/8" tube
which goes through the firewall to the induction...

MikeM