tachometer calibration

[superwesman]

K75S

at rest, tachometer points to 2500 RPM.  at idle, it shows 3500 RPM.  it seems to move up and down freely like it works, it just needs to point to 0 with the engine off.

I looked at the tachometer repair PDF in the lieberry but I'm still not sure what I might need to do to fix this.  It's going to be a winter project but I wanted to do some research up front.  What can/should I look for inside to fix this?   

[frodef]

Just open the thing up and twist the needle to the correct position. Remove cluster from bike, undo the 9 (or so) long screws in the back of the cluster, remove back plate, remove a few more (6 IIRC) short screws around the edge of the instruments, and you can remove the instruments while you pull the trip-meter-reset button so it's out of the way. Now you'll have access to the needles etc...