oil pressure sending unit

[Huw Powell]

> Subject car is '90 100, ( but my '90 200 looks the same).

> I get a oil pressure warning symbol on the dash display.  Oil
> pressure guage reads ok and I temporarily installed a mechanical
> guage and pressure is OK. The Bentley shows two oil pressure switches
> besides the oil pressure sending unit.  I can only find the white,
> high pressure switch on either car. Not the brown low pressure
> switch. Could the second terminal on the oil pressure sending unit be
> the low switch? 

No, the second terminal is the one for the oil pressure gauge.  The 
second pressure switch *should* be fairly near the first one - a few 
inches ahead or behind it, perhaps.  It's also quite a bit smaller than 
the two terminal sender.

It may very well be buried under things like the heater core water pipe, 
crank vent hose, random wiring, etc., though.  Dig into the grime and 
see if you can find it.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/