Rich,
First off, the Evans simulator is a single LED.
The TMCC that I installed in the B-unit is the Electric Railroad Cruise Commander. I cut the wires from the pickups on the two A-units and only pick up power on the B. I ran wires from the CC to the motors and lights in the A's. I used two different size headers for the plugs so as not to get them confused. I fed the wires through the windows on the ends of the units but, I did have to enlarge those windows slightly to get the plugs through. One other thing I did on the B was to mill off the motor mount to allow added space for the Cruise Commander. I didn't install a program/run switch, but instead used a temporary jumper wire for programming.
Ray
