T100 Regular Cab Pickup 2WD L4-2693cc 2.7L DOHC MFI (1998)
Oil Pressure Warning Lamp/Indicator: Testing and Inspection
INSPECT OIL PRESSURE WARNING LIGHT
a. Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
b. Turn the ignition switch ON, check that the warning light lights up.
If the warning light does not light up, test the bulb.