VW engines that have a high and a low oil pressure switch.........
the high pressure one uses reverse logic.
it never supplies ground, except when there is suffecient pressure to make
it supply ground,
which is the reverse logic of 'normal' oil pressure swithes......the type
you find in single oil pressure switch engines.........or for the low
pressure in two oil pressure switch VW engines.  The are grounded, until
there is suffecient pressure to open , or break, that ground connection.

make sure your 'normal' low pressure oil switch is the kind that supplies
ground when there is no oil pressure. Like test it with a test ligtht.
No oil pressure - it's supply ground to the circuit.
a test light can be used to find power or ground of course.
that, and only that, is what you want taking to your insturment cluster, if
it is the kind of vanagon instrument cluster that interfaces with a sinlge
( low ) oil pressure switch only.
hope that wasn't confusing.
scott
www.,turbovans.com

----- Original Message -----
From: "neil N" <musomuso@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, August 06, 2008 1:44 PM
Subject: Oil pressure switch question (air cooled)

> Hi all.
>
> I may have the incorrect Jetta oil pressure switch (1.8 or .9 bar
> "high" pressure switch) connected to my air cooled Vanagon oil light.
>
> If I'm reading it right, Bentley shows the stock air cooled oil
> pressure switch as closed until oil pressure comes up, (engine
> running) thus shutting off the oil light.
>
> True?
>
> Extra Reading: --- ;^)
>
> IF my Jetta high pressure oil pressure switch is connected to my
> Westy's oil light, it might be supplying a ground to the brake warning
> light when it shouldn't. Likely part of my troubles right now.
>
> Thanks,
>
> Neil.
>
> --
> Neil Nicholson '81 JettaWesty "Jaco
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines
> http://web.mac.com/tubaneil
> http://tubaneil.googlepages.com/