yeah, remove the speedo, open it up, remove the L -shpaed circuit board that
is the DOPS.
it's shown in Bentley in pictures.
That's one over-kill way.

you could try just grounding the wire in the engine compartment that goes to
the oil prss. switch by the crankshaft pulley.
'that wire grounded' is equivilant to 'enough oil pressure over 2,000 rpm'
( or whatever the rpm threshold is for that part of the O P warning circuit
is ) .
If this doesn't do it,
remove the little electronic circuit from inside the speedo as above.   I've
done it on a jetta before. I kinda remember  that the basic oil warning
light still workedon that one. .........though I can't say about a vanagon
for sure right now.
Scott
----- Original Message -----
From: "Jim Felder" <jim.felder@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Saturday, July 18, 2009 2:11 PM
Subject: Stopping the oil buzzer under the dash

> I've decided to pull the oil buzzer in my daughter's 91 while I figure
> out that the real problem is. It doesn't have low oil pressure, but it
> exhibiting the 2200 rpm syndrome where after it hits that engine speed
> the buzzer stays on. The light blinks continuously no matter what the
> car is doing. It's been doing this for hundreds of miles. I just
> swapped out both sensors... what a job... no change.
>
> Can anyone tell me how to just stop the infernal buzzing?
>
> Thanks,
>
> Jim