Celica, Cressida, Land Cruiser, Supra, Tercel & Van

Unplug sending unit connector. Connect a 12-volt, 3.4-watt bulb in-line with sending unit lead and ground. Turn ignition switch on. Bulb should start flashing and gauge pointer should deflect.
Using an ohmmeter, check resistance between gauge terminals. See Fig 1-Fig 6 . On Land Cruiser, resistance should be about 55 ohms. On Celica, Supra and Van resistance should be about 42 ohms. Replace gauge if defective.
To check sending unit, unplug connector from sending unit. Connect 12-volt source to sending unit in series with a 3.4-watt bulb. Bulb should not light with engine stopped. With engine running, bulb should flash. Flashes will vary with engine speed.

Fig 1: Oil Pressure Gauge Terminal Identification (Celica)

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Fig 2: Oil Pressure Gauge Terminal Identification (Corolla)

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Fig 3: Oil Pressure Gauge Terminal Identification (MR2)

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Fig 4: Oil Pressure Gauge Terminal Identification (P/U & 4Runner)

Fig 5: Oil Pressure Gauge Terminal Identification (Supra)

Fig 6: Oil Pressure Gauge Terminal Identification (Van)