? Do you need two threads for the same question?
Retrofitting CC is no easy task not only wiring considerations but also the reprogramming of the ECU - a dealer only job unless you have low level programming kit capable of adressing both canbus channels to address and enable it.
Hi I managed to successfully retro fit cruise control to my Mark 1 and it is running fine . The steering wheel with the buttons from eBay, ( £45)
then sent it into Ford dealership for configuration . I got this at a reduced charge of £25 as I was owed a favour from the dealer . Not sure what true cost would be . Hope this helps .