In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

I would be concerned about the zener diode interfereing with the operation of the ignition coils (I assume thats the line you'd be tapping), the best would probably to using an inductive coil to pickup the signal from the line in an electrically isolated method. Another method would be to AC couple the power line of the battery (but would likely need more signal conditioning). Or use the OBD-II interface.

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