Still working out the kinks in the new bike.

Took her to the shop to get a broken shift seal replaced and asked them to check out the tachometer too. The end result is that the shop said the tach is gone and a replacement is the way to go. I don't know that i'm convinced.

The symptoms are that the tach needle either flies wildly or lays flat. Occasionally when i start her up with the choke open, no revving, it'll bounce around between 1500 and 2k. Most of the time while riding it'll lay flat and not move, but occasionally on large revs will bounce to the top for a second before it falls flat again.

The tach itself (housing, bevel, whatever) shakes . . . a lot. Not violently, but enough that i could see that screwing up a spring in the housing -- basically like a mounting screw is loose or crooked. Curiously, hitting/tapping the tach gets it to read a bit better, and pressing down on it (little bend on the mount arm) gives what looks like accurate readings (or, well it responds to the throttle well), but that's not a feasible solution while riding . . unless someone has a third arm they can lend.

I don't know where to trace to the coil it's connect to to see if anything is frayed on that end.

Any ideas, solutions, thought, bike karma would be appreciated. Not a major thing, but it'd be nice if that needle stopped dancing . . . or rather started dancing the correct steps.