I don't know what the stock oil pressure switch is set to turn on at, but we see this normally after a session when the oil is hot, over 200 degrees (which is no problem). The oil thins out a bit. If you ever see the light come on at anything other than idle then you have a serious problem. You probably have 5-10 PSI when the oil is hot. I use redline 40wt full synthetic racing oil.
If you want to reassure yourself that all is well, definitely hook up a test port to the oil gallery where the above pages show. Thats where we monitor the pressure. Ride a while to get the oil good and hot, and check the gauge when at speed (if possible) and again at idle. If you have an IR gun, check the oil temp in the pan to determine the temp). We use a separate oil pressure switch set to about 15 PSI, and the light will turn on when idling around in the pits.