I still haven't changed the oil to 20W50 or put on an OEM filter 
(soon though), but I've been searching the archives.  From a summary 
of how the oil pressure system works:
 
http://www.med.umn.edu:8853/cgi-bin/msg?m=msg02115&a=/v96/vanagon.96.
01

it says:

"There does not appear to be a condition in a normally operating
monitoring system when the light should be on steady."

That's exactly what mine does.  Comes one steady (not flashing) and
no buzzer under 2000 RPM, meaning it's the .3bar sensor.  According
to Ron Salmon, there were 2 specs on sending units, but of course,
I'm not sure which one I have.  

So I've been pestering individuals about how to install a real 
pressure gauge.  :-)

We'll see how it goes after the oil/filter change.  In the meantime, 
I'll start saving for a rebuild, just in case.  :-o

-Karl
Karl F. Bloss - blosskf@ttown.apci.com
'87 Vanagon GL  "Beverley"
http://www.enter.net/~bloss/vw/