Slant Six Oil light coming on — need a new pump?

Thanks for the reply. I'm wondering if there is anything I can do without having to pull the engine. The nipple that the filter spins onto has a hex head, can this be replaced? Then maybe run some kind of cleaner through the oil system, replace with a heavier weight of oil and I'm good to go? Sorry to sound a bit ham-handed but I'm wondering if I can get away without making this a big to-do, especially if I plan to do a small block swap in the future.
Yeah, everybody wants a magic wand to not pull it, but if it has low pressure on the gauge, the pan will have to come off one way or the other and the easiest way is to get it out of the car. Everybody thinks it's their worst nightmare, but my God, it's probably only about 20 bolts and you're there. Compared to pulling the engine on a new car, a child could do it. If you get hung up on something, we can walk you right through it if it has to come out. I sure as hell wouldn't do it laying on my back under the car. Good luck!