I have put the failsafe details on each of the WI kit manufacturers, re: "whose, who, what...." post.
This thread deal mainly with different kinds of failsafes. Some failsafe is more safer than others. If you can think of any other safe way to detect WI failure, please contribute - I will put them in on the first post.
I am trying to urge people to consider the importance and effectiveness of a failsafe system before tuning your engine too aggressively.
Richard