I've been experimenting with using circuits to set recipes. This latest one was a lot of fun because it has to make water to feed back into itself for the other two recipes. The circuit logic is surprisingly simple with the new selector combinator and combinators being able to use red and green wire signals separately
It looks like:
Constant combinator with the three things he wants
A decider combinator : for each signal on red, if it's greater then green (what's in the storage tanks) output each signal
A selector combinator: probably choosing the biggest signal (the type of fuel most in need)