Quote:

The question is, can the tach cause the igniter to fail or does the igniter failing cause the tach to act up?
What say Gurus?



If the gurus are going to be silent, that opens the door to wild speculation.
There are 2 Speedmasters and 2 Americas identified on the igniter thread. Don't know what the other bikes are, or who has a tach or not.
I would think the tach gets its signal from the ignition, so the CDI failure could send the tach haywire. Especially considering the fact that you changing your igniter fixed your tach.