I had this same problem out of the blue on a customer's van the day before
they were going to come and pick it up.  Wound up being the sender, but
also check the wiring to it to be sure there are no bare spots.

On Wed, Feb 12, 2014 at 1:56 PM, Rocket J Squirrel <
camping.elliott@gmail.com> wrote:

> Started the van (1.9L) this morning. Dampish morning, 40 degrees F (a
> mild morning, it was 55 degrees colder than that two weeks ago). The van
> hadn't been driven for about a week.
>
> The oil pressure lamp did not go out. The oil pressure gauge I installed
> a couple years ago read normally (75 psi, cold engine, idling, 0-40
> weight oil), so I sat for a moment and decided to trust the gauge.
>
> Over a period of about 3 minutes while driving, the oil pressure lamp
> dimmed until it went out.
>
> Took care of my errand (had a crown installed at the dentist's), which
> took about 20 minutes, and when I started the van again, the lamp
> behaved normally: lit then went out after a few seconds as it normally
> does.
>
> Bad sender or something? Isn't that sender a switch? What's with the
> dimming then?
>
> --
> Jack "Rocket j Squirrel" Elliott
> 1984 Westfalia, auto trans,
> Bend, Ore.
>

--
Thanks,
Ken Wilford
John 3:16
www.vanagain.com