[buzzinhalfdozen]

Most aftermarket Ign. systems use a "time based" way of operation, basically it sees the trigger then creates it's coil trigger a set time from the input. There are systems that use actual crankshaft position to base their triggering but they need a more precise way of knowing where the crank is in it's rotation ie. multi toothed crank wheel.The later system has been used for many years now on new vehicles to more precisely control both fuel and spark.There are many aftermarket companies who make these type setups they are a bit more complex, however they do work very well. Joe