More weird science. I gave away my factory console mounted tach in favor of a handle bar mounted Drag Specialties tach. To the best of my understanding, I wired it just like the factory tach. When my igniter failed, the Drag Specialties tach still worked.
More weirdness, part II - When my igniter started to fail in Fall of '08, the right side went down, then during trouble shooting in Spring of '09, the right side came back up, and the left side went down. Very confusing to trouble shoot until I found a working igniter. (See also, a long list of "help me soon, or I'm clearing a path to the swamp that can accommodate a flaming motorcycle" posts)
Weirdness part III - My bike was built in 11/04, making it an '05. There was a TSB I believe that was first published in 06 or 07 ? recommending the flywheel sensors should be moved from .1 mm gap to .08 mm gap. (I may be off on the decimal - heavy cipherin' for me) I took the side cover off for the first time in '09. The sensors were already dead nuts at .08. The side case has NEVER been off prior to '09.
Who said Lucas is dead?
I'm sorry for only making it worse Terry, but thems the facts