I also sent this in response to the email you sent in to Tech Support at FAST:
Where did you rip it?(picture maybe?) There is a resistor and a couple of diodes under the shrink tubing on the wire where it changes from black to red.
Normally the red end is what connects to the MSD box, and the black end plugs into the RPM module.
You can buy a whole new MSD input cable for $14.
Let me know if you have any questions.
__________________
Matt Maxwell
Technical Consultant
FAST/COMP Performance Group www.fuelairspark.com
1-877-334-8355