I've found this circuit useful to warn of low hot oil pressure over 2000 rpm on an engine with
borderline pressures. If you are *certain* this is not the case with your engine, you could
disalbe it as others have suggested. But if it were me, I'd replace the "L" board - it is the
same one used in A2 golfs/jettas (gas model). In fact, I have a spare one taken from my '88
Westy (gas) which is removed to install the diesel version with my TD setup. I found the
warning useful enough to ensure it was functioning with the new engine.
You're welcome to have my old one for $5 + postage...

On 4 Apr 2006 at 12:23, Tim Leek <tleek@LL.MIT.EDU> wrote:

> Vanagon people,
>
> I have an 87 Vanagon that likes to buzz at me and flash the oil light
> after 15 minutes.  Super annoying.  Wife wants me to sell the piece
> of $*&#$.  Oil pressure is fine (according to click and clack).  Yes,
> I've replaced both oil pressure senders.  No, I don't have time or
> money to diagnose the wiring harness or that dynamic oil pressure L-
> board behind the speedo.
>
> So ... I'm looking to disable the buzzer somehow.  Here are the
> options as I see them.
>
> 1. Short the 0.9 bar sensor where it comes into the L-board to
> ground.  This works, i.e. if I pull over whilst the buzzing is
> happening and do this, the buzzing stops.  But is this a bad idea
> somehow?
>
> 2. Remove that stupid L-board, since (after staring at the wiring
> diagrams) doesn't it just serve to warn you when the oil pressure is
> not in spec?  I can't see how it actually "controls" anything.
> Unfortunately, I've tried this and it means I can no longer start the
> car.  Perhaps I can't just take it out without jumping some magic
> wires together?
>
> 3. Find the buzzer and kill it dead.  Okay, so where the hell is it?
> Is it the wee electro-mechanical looking device on one end of the
> aforementioned L-board?  Is this bad idea since that buzzer wherever
> it lives buzzes when other bad things happen that I may want to know
> about like engine getting too hot.
>
> I'm leaning toward 1.
>
> Help!
>

Shawn Wright
http://members.shaw.ca/vwdiesels
'88 Westy 1.6TD 5 speed
'82 Diesel Westy 1.6NA
'85 Jetta Diesel 1.6NA