Isn't that 2-wire from the harness for the tachometer? The plug from the coil comes from underneath, and shares an exit from the harness with a plug for under the master cylinder, no?
There should be a cable coming from the new dizzy to the side of the coil pack.
I just went through cleaning all the connections on mine. It's so much happier now.
-Tim
http://www.morSpeedPerformance.com