If your engine and its dynamic oil pressure monitoring system are both stock, you have two pressure sensors, located in the two places referenced.  Now, why does a vehicle need two oil pressure sensors?  I do know they each signal at different pressures, so you know if you have low pressure at idle, and also know if you have low pressure at speed (or know that you have adequate pressure).  But stock, both connect to the light.

Sometimes people who install a gauge disable the light, and remove one of the sensors, keeping the one easiest to access.  But if your light works, this hasn't happened, unless the person found a way to operate the light with only one sensor present.

Though I have a gauge, to me, having the light work is a fail-safe mechanism, as it will get one's attention for sure.  So, previous owner had disabled the light and kept only one sensor.  I've everything set up with both sensors again, so both gauge and light work.  Like it better that way.

At least that's how I understand it.

DMc

---- Greg Potts <greg@POTTSFAMILY.CA> wrote:
> Hi Jake,
>
> There's a pressure sensor down there? News to me. Only pressure sensor I
> am familiar with on my vanagon is the sensor between the 3-4 cylinder
> pushrod tubes.
>
> Haven't seen any stray wires disconnected either.
>
> FWIW, this is a 1.9 longblock wearing 2.1L cooling and FI hardware
> installed into an '87 chassis.
>
> Happy Trails,
>
> Greg Potts
> Toronto, Ontario Canada
> 1973/74/79 Westfakia "Bob the Tomato"
> 1987 Wolfsburg Weekender Hardtop
> www.busesofthecorn.com
> www.pottsfamily.ca
>
>
> Jake de Villiers wrote:
> > Check the connector on the pressure sender down by the oil pump and
> > crank pulley.  If you've left it off the blinking will not stop.  =)
> >
> > On Sat, Mar 6, 2010 at 4:42 PM, Greg Potts <greg@pottsfamily.ca