Sam,
The circuitry is looking for an input from a sensor your van does not have.
You need to find that input and ground it.

Ken Lewis
86 Transporter Crew Cab
60 356 T-5 Porsche
http://neksiwel.20m.com/
Vanagon tech, pixs, O2 monitor gadget
----- Original Message -----
From: "Sam Walters" <sam.cooks@VERIZON.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, April 25, 2004 6:23 PM
Subject: [VANAGON] Wiring tach triggered oil pressure alarm - ?? - help

> Today I finally got around to finishing wiring the tach in my 85
> Wolfsburg Weekender.  It has an 87 dash that I put in months ago.
>
> Only problem is that when I connected the wire to the coil, the oil
> pressure alarm and light started going after a few minutes or when it
> gets over about 3500 rpm - can't exactly tell what is the trigger
> point.  Tach works great.  Nice smooth movement, reads exactly as one
> would expect from the engine sounds.
>
> Van has enough oil.  Oil pressure light and alarm don't come on when I
> disconnect the tach wire from the coil, and didn't ever before today.
> About 17k on a rebuilt engine from a very reputable rebuilder.
> Seriously doubt I have oil pressure issues.  Oil pressure light, as
> always, lights up at cranking and then goes out.  Reconnect and they do
> come on.
>
> Haven't driven it very far with it screaming at me.  Of course, the
> first time it worried me seriously, but I was only a half a block from
> the house.  Stopped, checked the oil, and drove back home.
>
> Disconnected, no sounds, so I went for gas and another errand with no
> indication of a problem.
>
> So, is there some careless error I could have made in wiring, or
> something about the 87 cluster that would cause this?  Or a likely point
> for some sort of short in the cluster wiring?
>
> For now the wire is not connected as I have to drive carpool 42 miles
> round trip in the morning.
>
> Thanks in advance for your help.  Not urgent, but it was frustrating to
> think I had it all done correctly and then have this unexpected problem.
>
> Sam
>
> --
> Sam Walters
> Baltimore, MD
>
> 89 Syncro GL
> 85 Westy Weekender
> 84 Vanagon, original owner, soon to be retired, just too many problems
>
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