rear Main Seal noobie question

Ok I was just making sure on all this. That offset idea is one I'll make note of when I do it. I'm positive it has to be coming from the rear main seal. I replaced the factory oil pressure sending unit with a line to an aftermarket mechanical gauge and recently replaced all the upper and front gaskets. I can visibly see there's no leaks coming from the upper portion of the engine. The only reason I didn't do the rear main seal is I'm used to needing to pull the tranny off to access it. If I had known it would have been so easy I would hav just done it when I had everything apart.... I guess hindsight is 50/50 though