You can disable the false alarm by bending one of the pins from the oil
warning board to the side so the blue foil connector misses it. The pin
is the tach signal pin. With the pin bent to the side the oil circuit
board won't know what the rpm is and won't look for the missing high
pressure switch. The oil light will still work.

The pin is the outer end pin of the group of 4, not the group of 2.
Bentley page 90.23 shows the blue foil and the 6 pins. The pin is number
6 at the top right of the page.

You don't have to take anything apart. Just pry the 6 pin connector from
the back of the speedo. That exposes the 6 pins in the back of the
speedo housing. Then push that pin 6 over a little. Then plug the
connector back in making sure it misses the bent pin.

Mark

HotelWestfalia wrote:
> I installed an istrument that looks and works in every way the same as the '85 one I had in there, except this one makes the buzzer go when the engine speed is over 2k rpm.
> The question is; can I disconnect that feature from this later model one or do something that will stop the buzzer?
> Or whatever is the solution to this problem
> Zoltan
>