the two wires you are looking for are the brown and blue wires that are on the ballast resistor itself...not the wires going to the ECU...
take those wires off the ballast resistor...hook up a test light..have someone turn the key to start...one will light up....release the key to the run position...the other should light up and the 1st one goes dead....connect those two wires together....then run a new wire from the black-blue wire to the small red wire on the msd 6....that will turn the msd unit on and off.....