Well I don't think you actually need a manual (except for those wires). But even there you can get by with the codes (they are in the extras). If you have the bad luck and the game asks you for a code that's not in there, well...
The best way would be to save the game before you go and connect the wires. So if it asks you a code you don't have, you can always restart (and hope it asks you a code you know).
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