Oil Pressure Warning Light
WARNING: This page is about a different car, the 2001 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
Oil pressure warning light receives its ground from engine oil pressure sending unit mounted on engine. See Figure . Oil pressure warning light illuminates when ignition is in RUN position. When engine develops oil pressure, circuit to ground opens, turning off oil pressure warning indicator light.