Norm,
probably overkill, the Electra-X head just needs a 14mm x 1.25mm threaded hole (14mm spark plug thread), counter-bored 25mm on top, to fit the classic decomp valve more or less opposite the spark plug.
Bumpkin,
some of us here had Electras when they first came out and still haven't quite eliminated the nervous twitch... They can actually be brilliant bikes once you've eliminated the major known issues, though Norm's Electra-X had some serious quality control failures if I remember rightly, I think he got the worst one out of the factory.
Don't forget these bikes are now 10+ years old and some electrical issues shouldn't be unexpected.
A.