At 12:04 PM 1/1/2014, Steve Cotsford wrote:
>So far I have not heard a buzzer sound.   I may have to check.   The
>buzzer may be absent .

The blinking light indicates that the circuit board is present, not
likely that the buzzer is missing.

>    If the red light is off at 2500 rpm and does not come back on
> when the engine idles back down, does this signify that oil
> pressure is adequate?      Thanks Steve

At the moment everything is unknown.  If you want to know what your
oil pressure is, put a gauge on it.

You can check electrically what the senders are doing.  Once you've
idled long enough for the light to start blinking, unplug the
two-position connector that takes the two O/P senders into the main
engine harness.  Follow the wire from the after sender and you'll find it.

With it unplugged, the side sender should show open circuit to ground
(more than 100 Kohms, say**).  If it doesn't, you either have very
low pressure or the sender diaphragm is leaking.

The after sender may show open or closed, it's not the issue
here.  At cold idle it should certainly be closed, at hot idle it may
be open but will close as you rev the engine.

With the engine off, side sender should be grounded and after sender
should be open.

With the senders unplugged I believe you should see no blink at idle,
blink and buzzer above 2,000.

**When the sender is closed it should show no more than a few ohms to
ground.  When it's open in theory it should be many megohms.  If it's
failing it may not be actually closed but still have resistance low
enough to trigger the alarm circuit.  I don't know what the
resistance threshold is for that circuit -- it ought to be less than
say 100 ohms but VW seem to have a propensity for sensitive circuits
that might false-trigger on a higher resistance.

Yrs,
d