[urq] oil pressure gauge gremlin

[Geraint Lloyd]

I am not a WR specialist, however various performance 1980s audis and vws
had 2 oil pressure switches. These were set at 2 different pressures and
were typically connected to the autocheck or dash buzzer etc.

One was closed to earth at zero pressure and the other open to earth at zero
pressure. I can't remember which way around it is, but I would suggest
finding the other oil pressure sender and putting the gauge sender in place
of that.

On the Golf 2 gti, there was one oil pressure sender on the filter pedestal
and the other on the back (gearbox side) of the head. I always assumed that
this would show clogged filters and starvation at the cam respectively,
although hydraulic tappets also provide an audible warning of the latter.
I would suggest that the URQ would have a similar arrangement, but as I
said, I'm not a WR expert.

Geraint

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of SpotatAshleys
Sent: 09 March 2008 16:19
To: urq at audifans.com
Subject: [urq] oil pressure gauge gremlin

Here's a question for an Audifan with a WR engined quattro (or intimate
knowledge WRs)
I want to fit a VDO oil pressure gauge (and oil temperature gauge) from a
Coupe GT. Currently, the car (an '87 WR) has a two terminal oil pressure
sender (terminals presumably marked WK and G - WK for autocheck and G for
gauge). One wire (Blue with white stripe) is connected to one of the
terminals but I can not see which terminal.
To test the gauge before trying to fit it I connected the gauge signal wire
to the (currently) unused terminal on the sender. When the ignition was
switched on, it resulted in the gauge needle going all the way across the
scale suggesting a short to earth. I deduce from this that I had used the
wrong terminal (as I say, I can not see which terninal is which with it in
situ). So I disconnected the blue/white wire from the other terminal on the
sender and connected the new gauge signal wire to this. Now when I switch on
the ignition and start the engine the gauge works correctly. Only problem
now is that the oil pressure light on the dash stays on all the time and the
auto check lady keeps telling me to check the oil level.
Anyone know a) what is happening b) what should be happening c) what sender
or senders the car should have and what they do, and what colour they are/
part # etc.
I do have another drilling in the block that could take a second sender if
that will achieve what I want i.e. the gauge to work and the autocheck to
function as it should also.
I would stress that I know for certain that there is no problem with oil
pressure or oil level. This is purely an electrical issue.
As always, any information gratefully received.
Many thanks

Keith

'87 WR
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