The pickups for CH and other EIs are Hall effect transistors. CH sells the pickup with lead and Deans plug attached for around $7.00. They also have the magnets. Try their web site @ ch-ignitions.com.

There is another site I have seen on transistor ignitions for model engines it is jerry-howell.com/ignitions.html. They have a couple of kits and sell the coils. I haven't tried one, but intend to sometime when I get caught up on some other projects.