Recently I have installed a 1990 cruise control unit in a 1993 245 that never had cruise before in it's 28 years. The cruise control was from a '90 240 sedan that I owned since new and retired at 424k because of rust issues. The cruise always worked properly for 30 years.

Now, I have installed it in the '93 I believe correctly but it doesn't work. There are install instructions on the internet indicating that there should be a orange wire that attaches to the double spade terminals on the back of the instrument cluster, I can't find a loose orange wire for this purpose....just a small pink and the white/red wire that goes to my new 52mm small tach. I see there is a orange wire within the big plug-in for the computer box so I would guess that is why there is no loose orange wire. I have adjusted the brake pedal switch with any success.
What else should I look for ?

Duck