I purchased the mini tach from J&P to install on my 09 Iron. The wiring instructions that came with the tach say to wire it to the (-) neg coil wire. I also got the service manual and in it I cannot locate this neg coil wire. Does anyone know how to wire this up? I used the "search" and most all are different bikes or used a tach adapter which I would prefer not to do if possible. Any help from the electronically gifted, would be appreciated.