Nah, I don't, just the stock idiot light. And it's developed this other lower knock after I shot the video. I think at this point the inconsistent tapping in the video is the intake (an injector probably), but now it's got something noisier... it's possible you're correct, though, since it only does it when warm, maybe it is the oil pump. Well, maybe that means it's an easier fix for someone who wants to buy this truck.
I'm going to let it sit on the market for a bit, if it doesn't sell, I'll probably go that route I suppose, but I'm going to give it a chance for now.
EDIT:
Well, Darin (I hope I spelled that right, it's been so long!
), I'm gonna go ahead and give this oil pressure gauge a shot this weekend, and see if that's what it is. An oil pressure gauge is a fairly cheap diagnostic tool. Thanks for the advice.