Tried to take my bike out for a ride this morning and the oil light came on after it warmed up. I shut it off immediately, waited a few minutes and started it again. There was no light, so I tried to ride again, but it came on again a few seconds later. I limped home by running it for a bit and shutting it off every time it came on again. One time, it stayed off for a long time, I even let it sit at idle and it never came on. I tried to ride again, but then it came on again so I went back home and shut it off so I don't mess anything up. I checked the oil level before I ever started it and it looked good. what could it be? what should I check first? I've heard of manually checking the oil pressure, but what do I need to do that? anything else I should check?