Hi there, I have a 2004 xvs and looking to get a small anolog rev counter to fit, I have noticed that some come with 2,3 and 4 wires which would be the correct ones to get also would I need one for twin spark (if that makes any sense) is that because its a twin cylinder? Ive only had the bike a month so dont know too much about it yet. any help would be most appreciated, thanks