"Where do you get an extension for the RPM lead?" -----> I made my own by splicing the wires and adding some new wire. Soldered each joint and used heat shrink tubing on each wire then a few bigger pieces around the grouped wires.

Glad to see you are getting better starts. Come to think of it now I believe I still get some popping at idle but nothing that I've had to worry about. As soon as I bump the throttle it seems to go away and it is smooth after that all the way to full power and back.

JR