Look closely at the wires, particularly the colours, and match them with the right colour fuse.
You can also look at the monitors. All the slots are numbered, with little orange marking. The little boxes next to the shapes on the monitors are pips, meaning one, two, three, et cetera. Compare the shape on the top of the fuse with the right monitor, and then you know which number it is, and which plug to use it on.
It is partly a bit of a red herring (as it is a lot simpler than it looks), but it is also a way to ensure that you can do the puzzle even if you cannot differentiate between the colours, as a fail-safe.