Allen,

There are lots of posts in the archives, particularly from Mark Drillock
and Dennis Haynes, discussing the workings of the oil pressure system in
the Vanagon.  You could find all you need in a search using these names
and only covering the last year to 18 months as the questions come up
repeatedly.

At times this problem is caused by a ground connection that has come
loose or otherwise gone bad, but don't assume this and drive.  Find the
cause of the warning.

Good luck.

Sam

--
Sam Walters

Baltimore, MD