The T/M motor I'm using had a red & black wire plus 2 blue wires. The blue wires went to a thermal overload device which I removed. The original system had a slotted plastic disc on the end of the motor with an optical speed sensor wired into the controller. It was removed too since the system I'm using measures spindle speed instead of motor speed.
The original MC-20 (I think it was?) controller was tango-uniform so I picked up a used KBIC-120 controller (thanks to advice from MaxHeadRoom on the forum) on eBay for $28.00 and it works great!
edit: Oops, I'm slow today...I see you have pro advice from Max.
"Accuracy is the sum total of your compensating mistakes."
"The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton