Lawn mownster upgrade: Added one of those cheap hour counters, so I know when the oil change is due.
Unlike the last one (vibration sensing), this one is induction sensing. You wrap the wire a couple times around the spark plug cable and that creates enough induction for a reliable signal to the unit.
In fact, the cable isn't electrically connected to the unit at all, just clamped outside in a plastic slot.
Inside is probably a simple induction sensor or maybe just another coil - I didn't open it as it's sealed against rain.
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