this is a 2 terminal "single" ballast that comes with the orange box MP kit correct? If not (4 terminal "dual" ballast) holler. You only need 1 ballast. post the pri ohms of the two you have along with the pri ohms of the coil you are using & I'll give my on the best one to use. run the blue ign1 run wire (switched 12V) to the upstream "input" side of the ballast & T from right there to the "point" of the ECU which is the hot power in. connect the other "downstream" end of the ballast to the coil positive primary. Run the brown ign2 "crank" wire to the same "downstream" end of the ballast.