Does it work?

I don't understand how cam sensor pulls a signal. From the pictures in my Haynes manual all I can see are the TDC marks on the cam gear, but I thought those are for setting the cam angle by eye.

I can see that crank has a single notch, but that doesn't allow one to identify the compression stroke.

 

From the Helm's manual (should have got it so long ago) I can now see that the crank clearly has 12 teeth where one is a double tooth. The cam appears to have 4 identical teeth, but in my notes I wrote that one is doubled. Still stumped about how to control sequential injection or spark for that matter. May have to resort to oscilloscope to figure it out.