A12 - Hey, it wouldn't be as funny if you'd said "Hole A" !
(My car has TWO A-holes: one in the firewall & one in the driver's seat !)

Hole A is for a heater box stud.
My 4-speed NSS wire runs up over the bellhousing, to near the rt side valve cover, and joins a harness near the harness retaining clip there.
I would think all NSS routing would be the same, for assembly-line reasons, and that B is tach only regardless of transmission.
I could be wrong on that, but it would also dovetail with tach being called out on the body tag so B gets punched/drilled.