Think I've found the oil leak-- 1986 350 SBC

[KShortell]

Well, when I was poking around under the hood fixing my vacuum leak and smoothing out my idle last weekend,
I took a look at the oil pressure sending unit on the back of the block. The area surrounding it was a bit
wet with oil gunk. I'm not sure how to tighten this up since there's really no room to rotate it clockwise
without the oil sender(s) hitting the intake manifold. There's a short section of pipe/tube, a tee fitting,
and the 2 sending units. See the photos below for a visual.

Any ideas? This is the way it came from the factory. It's never been apart since it was built in 1986...