Moved
Here is the manufacturers website:
http://www.biketronix-racing.com/ No mention of a UK dealer sadly.............
However,
By co-incidence I was looking for a new multi-meter the other day and noticed that Maplin sell some very reasonable meters that have the ability to measure RPM from some sort of inductive loop!
Not sure if this really would help you find the wire you are looking for but good luck.