MSD

And just how much power is being drawn? You should be able to not modify the factory wiring, and disconnect the original coil + wire, connect that wire ONLY to the small red

Also be absolutely CERTAIN you have NOTHING connected to the coil EXCEPT the two wires from the MSD. If you have a tach, use MSD destructions, and you may need a tach adapter. DO NOT connect your tach to the coil at all