Just spotted this,......in the non m/cycle help board.Mebbe the webteam can move it?
Does'nt the 1098 use can line electrics similar to the 749/999? If that is the case,I would say fitting some aftermarket gear indicator would be damn near impossible. I cant say I've ever needed one,would'nt it become a distraction on the road?A lot of riders moan when the service spanner icon starts flashing.
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.
I tried for weeks to fit a gear indicator to my RC8 and found it impossible to get a strong enough pulse with the can bus wiring system. Even the manufacturer could not get it to work.
The most helpful company was Acumen, I told them it was one of their indicators and they tried their best to help, the wiring was fairly similar.