How do you change the oil pressure gauge in 2004 buick rainier

Usually when these Gauges go out it is because of a faulty BCM( Body Control Module) The BCM controls all dash instruments . If it is the BCM you will have to get a dealership to flash the new one. Before doing that though check all fuses under hood and inside. It should say gauges or BCM

80 is ok unless it says 80 when the engine isnt running,turn on ignition and check the oil pressure,it should read 0....

Have you changed the oil filter? Change the oil and filter.(USE the AC Delco filter and the 10W - 30 oil..(Wal-Mart oil is fine - it's made by a major refinery - HINT- Walmart does not own a refinery!!!) They buy the oil, have it put in their marked containers and sell it cheaper then others) I ONLY use Wal-Mart oil in everything!!..you might try a pint of Lucas oil treatment..
See if the new filter helps.. sometimes they are defective and block oil flow and the pressure makes it flow..

is the security light on or flashing? it sounds as if the security system has been activated possibly due to bad transponder or pass lock sensor.

its due a service, dont let it go to long as you will be shortening the life of your engine, if you cant afford a full service, have the oil changed only, leaving oil in the engine cause the most damage to any car as it looses its ability to lubicate causing friction and damage. hope this helps ( rate me thanks )

Fairly common problem on the 03-06 Rainier instrument clusters, it's caused by failing stepper motor on the cluster's circuit board and it can be fixed. Check out this page for more on it - Rainier oil gauge broken

Have your retain accessory power module checked out. ( RAP Module for short )

oh thats the change oil light expect it every 3500 to 4500 miles they glow.. you can usually reset it by holding down the trip button with the car off and then turn the key to the II position where everything lights up
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Buick Rainier 2004-06, Buick Rendezvous 2002-05 w/o (DIC) Driver Information Center
Turn the ignition to ON without starting the engine. Fully press and release the accelerator pedal three time in five seconds. If the CHANGE OIL SOON’ indicator flashes two times, the system is resetting. Turn the key to OFF, then start the vehicle. If the CHANGE OIL SOON indicator comes on and stays on for five seconds, repeat the procedure.
Buick Rainier 2004-05 wI (DIC) Driver Information Center
The DIC display is located on the instrument panel cluster above the steering wheel. The DIG buttons are located on the steering wheel. Press button with the gas pump symbol to display engine oil life. Press button with the arrow symbol to reset engine oil life display.
Buick Rendezvous 2002-06 wI (DIC) Driver Information Center
To reset Service Reminder Indicator, turn ignition on with engine not running. Press the MODE button until DIC reads oil life left hold SET to reset. Press and hold the SET button until 100% is displayed. You will hear three chimes and the change oil message will go out. If the CHANGE ENGINE OIL’ message comes back on when the vehicle is started, the engine oil life system has not reset. Repeat the procedure.

MY 2002 RAINIER DOES THE SAME THING I HAVE BEEN TOLD IT IS THE THROTTLE BODY. I NEED TO CLEAN IT OR REPLACE IT. I HAVE THE 4.2 AND YOU CAN GET ONE FOR $200 PLUS SHIPPING. THE THROTTLE BODY STARVES THE CAR FOR AIR CAUSING THE IDLE, AND SHUT DOWN PROBLEMS. I AM GOING TO TRY IT THIS WEEKEND.

plugs need regapped or changed malibu did the same until i changed them.