Oil Pressure Switch Test: Legend
WARNING: This page is about a different car, the 1991 Acura Legend and 1991 Acura Integra. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect Yellow/Red wire from oil pressure switch. With engine off, check continuity between oil pressure switch terminal and ground using ohmmeter. Ensure continuity exists. Continuity should not exist with engine running. If switch does not function as specified, but oil level and oil pressure are okay, replace oil pressure switch.