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systems, for example, use a 60 tooth crank trigger with two missing teeth.
MS1/Extra handles these types of distributor based ignitions with a wheel decoder that works as a front end to the distributor. The wheel decoder identifies which teeth on the wheel are functionally equivalent to distributor trigger points, and tells the distributor timing algorithm when to start its countdown. So on a six cylinder engine, the distributor timing algorithm would get triggered three times per crankshaft revolution. The distributor timing algorithm does not take the other teeth into account, as the wheel decoder could effectively make a 60-2 wheel look like a three tooth crank trigger as far as the distributor timing algorithm is concerned.