Hey Kwil, as regards the wiring confusion - I notice on the ebay post from the guys who sell the wiring loom :
https://www.ebay.co.uk/itm/PC2-05-4-...item255f0f56f4
"This lead will not allow you to continue using the controls on your steering column, however we do supply the adaptors to connect your new unit to these controls. Please contact us for advice on the correct part for your vehicle."
Maybe worth contacting them about the pinouts? Just a thought . . .