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Got it! Take a look at the output of the ping sensors with your DMM and see what level of AC voltage is coming from them when the engine is running. They're piezo electric voltage generators that generate an output voltage proportional the their input stress level and feedback the acoustic signature from detonation in the cylinders to the DME. There's only output there when the engine is running, and if it's high enough I can come up with a threshold detector circuit that will close a relay when there's an output from the ping sensor.
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