The oil reader remains stable at a quarter even though the oil is good

Khaled, I don't know anything specific about your vehicle, but in general oil pressure gauges work by reading a variable resistance provided by the sensor mounted on the engine block. So a change in that resistance should be reflected on the gauge if the gauge is working.

You'll need to locate the sensor on the engine. Watch the gauge as you unplug it; it will either go all the way to maximum or drop all the way to zero. Then if you ground the wire to the block, you should see the gauge go to the other extreme. If that all works, then you've verified the gauge is working and that you need to replace the sensor mounted on the block.

Otherwise the next step is to verify the wiring from the engine to the gauge; you'll need a wiring diagram to trace the wire colors and connections.