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2 terminals on Oil Sending Unit


It turns out that there are cars without oil pressure gauges that still 
have two terminals on the pressure sender.  Audi uses a "dynamic" oil 
pressure sensing system on the newer cars.  The one switch opens at a 
very low pressure, just like any "idiot light" equipped car.  The second 
one actuates at a higher pressure (I'm not sure if it is N.O. or N.C.). 
The computer checks this switch against the engine RPM.  If the tach is 
above 2500RPM (not exactly sure of the number) and the secondary switch 
indicates that the pressure is below spec then the oil lamp is turned on 
also.  It sounds like your car does not have the dynamic pressure sensing 
system or an oil pressure gauge.

Steve Buchholz