I hate tell you this but you need to remove your rocker cover to get the tach drive out. It has a C clip holding it in place. Back out your valve adjusting screws and remove the cover. 4 screws under the breather housing.
Wow, that's too bad.. I'll be holding off then, as the motor is finally running like a beauty and I'd like to enjoy riding it for a little while before I start taking things off again. But yes, thank you for clarifying!