Russ - Being a retired Dogface, I am not too tightly wrapped on naval architecture, but according to Norman Friedman (
U.S. Cruisers: An Illustrated Design History, Annapolis, MD: Naval Institute Press, 1984, pp. 110-125), the 5-inch dual purpose guns were initially controlled by Mk. 19 directors (
Naval Weapons of World War Two - John Campbell, N. J. M. Campbell - Google Books p. 110), which were located abaft the second funnel in close proximity to the guns. There was also a rangefinder/spotting glass for the 5-inch guns located directly abaft the tripod mast. Later in the war (and judging from the camouflage, your SLC is circa 1944, radar and later versions of the fire control directors were installed. You will probably get a better and more accurate answer from Nimitzfan if he is guarding this push.
Hathaway Veteran: Ed's book provides considerable info on the how and gives lots of examples, but his primary focus is on the operationalization of intelligence: how MacArthur made use of the information provided by ULTRA sources (he made use of it if it fitted his instincts and ignored it if not).
Don