Steven, one thing you might want to check is that the oil sender is the correct one.  Sometimes the wrong sender is installed.  If so, it may indicate low pressure when the pressure is fine.  At least that is something that happened in my experience.  I don't remember now which sender is which color, but they are colored differently.  If I remember correctly, 1.9 L engines use a different sender than do 2.1 L engines, which have the complicated system with two senders, one for low RPM, one for high RPM.  I put in the correct sender, and installed a gauge to match the sending units.

mcneely

---- Steven Shelton <shelton4@GMAIL.COM> wrote:
> We left today in our 1985 1.9L Westfalia for a one week camping trip when
> about a hour from home in Interstate traffic the oil pressure lamp started
> flickering.  I pulled over and checked the oil.  If anything it was over
> the full mark.  The engine sounded fine so i took back roads to get home.
>  The light stayed off at slow speeds or stop and go traffic, but at
> sustained speeds above 45 or 50 it would flicker, sometimes quickly and
> other times slowly on and off.
>
> The Castrol 20W50 oil only has about 1,500 miles on it, but it's been 6
> months since it was changed.  I'm changing it now.
>
> My question is, can there be a problem with low oil pressure if the light
> stays off at low RPM?  From what I've read, it seem like when oil pressure
> is low the light is more likely to come on when the engine is idling, not
> when it's running at 50-60 MPH.  The engine is VW rebuilt 8 years ago with
> 54,000 miles on it.
>
> Besides the oil change, the only other thing I can think of is to check the
> wiring at the sending unit when the engine cools down.  Is there anything
> else I can do before we try to leave again?

--
David McNeely