Yes, you jumper the foil plug with a 470 ohm resistor. That is what the
factory left out or put in to enable the later foil to work as a
replacement foil for both types. Resistor "in" for 84/85 tach foil
replacement with a simple single oil switch setup. Or resistor "out" so
the foil uses the dynamic oil circuit board found in 86-91 vans with 2
oil switches. Here is a photo of how to do it.

http://images.thesamba.com/vw/gallery/pix/486175.jpg

Mark

Stuart MacMillan wrote:
> Swapped my wonky '85 cluster for one from an '87, and the oil light flashes
> and the buzzer buzzes all the time.  I have an OP gauge, so I know
> everything is fine.  I need to rework the later type OP warning system to
> work in an '85.
>
>
>
> There must be a way to jump the plug or something that goes into the speedo
> to make this work, anyone know how?  I've unplugged it for now. Even with a
> gauge, I'd like to have the light, and now it doesn't come on when the
> ignition is switched on.
>
>
>
> The GoWesty foil replacement kit says it has a dip switch for this, so it
> must be possible.
>
>
>
> Thanks!
>
>
>
> Stuart
>