Bill:

You have two oil pressure sensing switches.
The low pressure switch (4.4) must open between 2.2 and 6.5 psi.
It is located between cylinder 3 and 4
The other switch (13.1) must close between 10.9 and 14.8 psi.
It is in the vicinity of the oil pump.
The flashing LED is associated with the 4.4 sensor.
The flashing LED and the buzzer occur with RPM>2000 and no switch closure
from the 13.1 sensor.

        The contacts on the VDO sender are normally closed as are the 4.4
contacts. Oil pressure opens them i.e. lack of pressure allows them to
close. The contacts on the 13.1 are normally open i.e. oil pressure
forces them closed. That is why bad/dirty connections in that circuit
cause false flashing LED/buzzer symptoms above 2000 RPMs.

Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 T-5 Coupe

On Thu, 21 Oct 1999 21:11:08 -0700 Davidson <wdavidson@THEGRID.NET>
writes:
>Okay electrical techs...
>I got set up with a VDO DUAL CONTACT Oil Pressure Sender and VDO oil
>pressure gauge. On of the contacts on the dual sender is to be
>connected to
>the new VDO gauge... the other contact is supposed to be connected to
>the
>existing wire that goes to the existing stock idiot light.... But I
>have
>read some stuff on the list about .3 bar and I am wondering if the .5
>bar is
>(a) the correct sender and (b) will the .5 bar dual sender make the
>idiot
>light (and buzzer) come on at the same pressure point(s) as the
>existing
>sender? Or does using the .5 bar dual sender change the calibration?
>All answers welcome,
>Thanks
>Bill
>90 Westy Syncro

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