Help with yellow plug wiring ce1 fusebox

Hi all,

Currently converting the early style fusebox to ce1 on my 1.6 gti, and I've come to wiring the plugs up and I'm missing a wire, please see below:


According to the wiring diagram I've been following it should connect to the thermo time switch which is coming out of the other engine bay wiring harness along with another red/black wire although I'm not sure where this leads to off hand . Is this correct?

Is it a case of connecting these two wires to a plug connector that feeds to the yellow plug? I can't quite see where it leads to in the top left image. Any pics would also be a huge help too!

thanks for any help in advance rich