The kill you bought is for a magneto engine. For an electronic ignition engine you need an optical kill. Go to the Valley view website and look at the kill they offer.

Honestly, I do not use an opti kill on my DLE 20. I just kill it by dropping the throttle all the way down, like a glow engine. I do use opti kills on my larger engines from 30cc and up.

I have the same GP switch you have on a G38 engine and it works great as well. It is not designed for your EI DLE 20 though.