what is your not sure about? look at the harness that plugs into the ECU, have a look at the diagram and work out which way up you are looking at the harness. Count across the number of slots, and tap into the wire with the corresponding colour coded wire on the FCD
I find the diagram easier once you work out which way up the harness is when you are looking at, after that its a matter of counting wires and a bit of soldering