I am now part way thru this job. I have connected to the wires from the ecu in the black plug, by cutting the required 4 wires short of the connector and extending a little into a 4 way ex-pc Molex connector, thence via 7 core trailer cable to the vicinity of the stalk switch location. I had to substitute the orange wire of the stalk for the brown one in the 7core as this does not contain an orange strand. (BTW the pins removed from the stalk switch leads are a very near match to the black connector ones needed, but getting them in was a problem due to 1- space, 2- not sure they would 'click' into the housing, but they fit the slots well).
I now need to fit the stalk, connect the 4 of the wires from that to the 7 core as per colours in that, watching for the fact that brown is the new orange. This then leaves the yellow one to connect. Most users of this stalk cruise switch connect the yellow to pins 1,3, and 4 (IIRC) on the brake light swich. As I have 4 wires going to all pins of a 4 pin brake light switch (not yet fitted, later today hopefully), it looks like I won't have to bridge pins 1 and 3 there, if I have this right, just taking a key switched live feed from a suitable other point. I have one in mind.
So, bottom line--do I have to take the yellow from the stalk to the brake switch, and pick up a feed there? Or as there are already 4 wires into/out of the switch, (2 normally open, for the brake lights, and 2 normally closed for cruise I think?) it is already set up for cruise apart from the + switched supply to yellow , and once that is taken from elsewhere, no further need to attach any connection to the brake light switch is necessary? If you see what I mean. In short, can I forget the yellow to brake switch and bridging pins 1 and 3 there if an alternative supply is used?
I am taking pics as I go and will hopefully be able to do a write up on here when finished. I may have to stop for a while and return to it later, depending on progress rate. I have some other things to do while I have the tools out and dash partially stripped.