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Trigger
The plan was to use a wire connected to the negative pole of one of the ignition coil primaries.
As suggested by Anita on IRC :\n
<Anita2> sandgren_ : the voltage there (igncoil primary) is a bit high. It would be nice to use a voltage divider, like a 2x270k to 10k <Anita2> and I would use HALL setup, with rising edge detection (the rising edge is much clearer, as there are 2 falling edges: a small 12V and a large 200V later => VR is not very good for this)
Note: The trigger is just for RPM, there is no ignition control with this application as the stock Suzuki ECU takes care of that.