From the Catalina FB page.... If it’s like my 1985 480, the two 157 gallon mains and two 100 gallon aft tanks gravity feed to the center 100...
The switches are on the bridge to the right of the wheel above the throttles. Small square on the far right, mid picture. Same approximate...
Remember these were Uniflite boats not original CC. I'm looking at an 1989 with the same setup. Did you ever get your answer?
Did you ever buy the boat? Did you choose another?