Sorry, Tim, but on all of my CJ2-A's and my CJ3B, the RHS headlight wires run across the top of the grille, on the "spacer" ahead of the radiator. On the CJ2-A's the wire for the RHS parking light wire runs underneath the grille (Why? I dunno), but the CJ3B has the parking light wire inside the headlight harness across the top. I don't have a CJ3A

, so I can't speak for them. Incidentally, my GPW is the same as the CJ2-A's.
The speedometer cable? Tim's link should show you which firewall hole it should come out of, and from there, there's not many ways it can go. If it's long enough, it can go inside the frame rail for a little bit. Just keep it from rubbing on the front driveshaft
BW