If the oil is overfilled, you may be whipping air into the oil, with a resultant loss of pressure. 

Karl Wolz
Sent from my electronic umbilicus

> On Feb 19, 2014, at 4:51 PM, Stuart MacMillan <stuartmacm@GMAIL.COM> wrote:
> 
> That is unusual, so I'm thinking it's a bad sender, or more likely the wire
> is intermittently shorting out on something with high vibrations from high
> revs.  Your situation is the opposite of worn bearings.
> 
> Add an oil pressure gauge and find out for sure!  It's the only way you can
> really know what's going on with these engines.
> 
> Stuart
> 
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Steven Shelton
> Sent: Wednesday, February 19, 2014 2:55 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Oil Pressure Light Flickering
> 
> 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?