Oil Pressure Regulation

Engine without Oil Pressure Regulation 

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Only one oil pressure switch:

1, 2 - Not installed

3, 4 - Oil Pressure Switch -F1- with Connector

Allocation. Refer to the appropriate Systems Wiring Diagram(s).

Engine with Oil Pressure Regulation 

Courtesy of AUDI OF AMERICA, LLC

Two Oil Pressure Switches: 

1, 2 - Reduced Oil Pressure Switch -F378- with Connector

3, 4 - Oil Pressure Switch -F22- with Connector

Also: 

Courtesy of AUDI OF AMERICA, LLC

3 - Oil Pressure Regulation Valve -N428-

Allocation. Refer to the appropriate Systems Wiring Diagram(s).