MSD=Multi Spark Discharge. m The scope patterns I've seen from engines running that system show 5 different firing lines for each spark plug in rapid succession instead of the one spike a normal ignition system presents. It's some sort of capacitive-discharge setup that rapidly discharges a capacitor across the coil primary winding repeatedly, causing the plug to fire several times.

It might be necessary to install a conventional ignition trigger to set the timing, then connect the MSD box once the initial timing is set. Personally, I wouldn't waste my time doing that unless I was running a race engine that might need a very hot spark. MSD is utterly useless for street driving.
Jerry

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