Kill switch wiring

[wepsbee]

GUYS! keep this simple AND reliable. Let the kill swx main posts disconnect the battery.
Let one loww current kill swx ground the grounded leg of the ignition coil, killing the engine but leaving all run consumers (fuelpump, etc) to load the alt as it coasts to a stop. (if you don't have a single coil, then put both legs of the low current circuit across the crank sensor, etc.
Not only is this a very simple circuit, but it fails safe in regard to cutting out the engine in competition-if the low current switch gets resistive/corroded, it doesn't effect running, just killing. Phil

Does anyone know if this simple circuit will do any harm to the MSD ignition system??