First I would follow the pipes and see what that goes to specifically. Grab a 14-EL instruction book (e.g. off the Web) if you need the backgrounder to understand what you are looking at. The reason is, some of those tanks have specific, calculated volumes.
It's easy to lose your mind down there, with fuel, sand, coolant and electrical wires running in pipe (interurbans are festooned with these). I, for one, am not beneath actually painting pipes, particularly to distinguish air pipes from non-air piping. I don't necessarily mean crazy colors, but certainly restoring the original black or galvanized appearance (use "cold galvanizing compound"). From there, some simple lettering. Even if you can't follow that pipe, identifying others lets you eliminate them.
It's entirely possible the previous owner straight-piped it because it was unnecessary for their needs. It is also possible that doing so was a mistake, and that hastened its arrival at a museum. Every museum I've seen has at least one of these failed modernizations.
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