2010 Mazda Mazda3 - Oil lamp

oil lamp on
I have mazda 3 model 2010 .
when the car @ standby and slant to left even slightly the oil lamp in dashboard is on .
I check the oil pump its fine and very fine does any one can help

For starts make sure oil level is correct, then attach a mechanical oil pressure gage to confirm oil pressure is adequate. If it is good try changing the oil pressure sending unit. I do not drive my car if the red oil pressure light comes on or even flickers until it is fixed.

Can you expand on that statement? What are the pressure readings you are getting?