Oil Pressure Check

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Be careful not to burn yourself, as the engine oil may be hot.
For M/T models, put the gearshift lever in the Neutral "N" position. For A/T models, put the selector lever in the Park "P" position.

Check the oil level.
Remove the under cover, using power tools.
Remove the oil pressure switch to connect the oil pressure gauge.
After warming up the engine, check that oil pressure corresponding to the engine speed is produced.

Fig 1: Locating Oil Pressure Gauge
Courtesy of NISSAN MOTOR CO., U.S.A.

Engine oil pressure [Oil temperature 80 °C (176 °F)]

Fig 2: Engine Oil Pressure Table
Courtesy of NISSAN MOTOR CO., U.S.A.
After checking, install the oil pressure switch as follows.

Remove old sealant adhering to the switch and engine.
Apply High Performance Thread Sealant.
Use Genuine High Performance Thread Sealant or equivalent. Refer to RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS .
1. Oil pressure switch :12.3 - 17.2 N.m (1.25 - 1.75 kg-m, 10 - 12 ft-lb)