I'm trying to adapt this circuit to a motorcycle without Breaker points. If I'm reading this diagram correctly, I can just attach the input to the negative side of the coil? What about using an inductive pickup (i.e. wrapping a few turns of wire around the spark plug wire)? BTW, my bike is 1 cyl and fires the plug every crank revolution so I'll be using a 100ua meter and modifying the face. 100 ua will equal 5000 rpms, 50 ua will be 2500 rpms, etc. Sorry for the off topic question. Maybe someone can help.