4 pin ECU doesn't work. Old 5 pin does.

Mine went out a few years ago. Just happened to be in front of an O’Rielly’s when it did. They had 2 different ones in stock, and neither worked. They ordered this Borg Warner in for me, and no problems since. I kept the box in case I ever had another problem. It is a 5 pin. This is on my '73 Dart Sport.