Oil Pressure Switch
WARNING: This page is about a different car, the 1996 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. Switch is located at base of oil filter. With engine off, continuity should exist between oil pressure switch terminal and ground. 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.