2004 Mitsubishi Outlander Oil Pressure Light Goes on when I

My Outlander (apart from what I am about to write) has run problem free for 4 years. Currently tho, when I idle the oil pressure warning light comes on. The oil is full, clean and new, recently changed (1200 miles). When in motion the light does not come on. I have also noticed that when idling at a stop light, if I move my steering wheel from side to side the light turns off.

I am assuming I have a sensor problem, but unsure which sensors I should be looking at.

Thanks