Originally Posted by CriticalMass
What I want to do is to be able to locate the speed sensor wiring on my '06 LT so I can determine if it's the 2-wire or the 3-wire type, so I can buy one of the speedo calibration devices available to deal with this issue.
You will have problems with this. From '02-on ('01 in Yurup/Canada), the speedo is fed from the same pulse sensor used by the rear ABS -- the pulse signal is shared by the ABS, speedo, radio speed-volume adjustment, and BC computer. The infamous "yellow box" sold out of Australia a couple years ago (a pulse train modifying device) couldn't address the problems caused in the other devices.
My suggestion: take a deep breath and pull the cluster if you really want to fix the reading. Once the cluster's out, all it takes is removing the clear cover and carefully prying the needle off it's shaft. Plug the cluster back in, turn on the ignition to let the speedo drive re-zero itself, then turn the bike off and put th eneedle back on -- I replaced mine about one division (3.33 mph) below zero, so the speedo's now exactly right at 30, about 1 mph fast at 60 (actual 59), and about 1 mph slow at 10 (actual 11). One final ignition-on trial to ensure the needle is where you want it after the start-up sweep, and to ensure you didn't push it back on so far that its underside is dragging on the face of the speedp, then button it all back up.
A link to a thread with final needle position pics:
A search on the old site forum on "needle pic speedo" will also turn up a post from Randy (look for the red user name) with detailed pics of the front and rear of the instrument cluster circuit board.
Oh, and while Mike was kind enough to credit me for this one, Randy was the one that thought of it first, while I was still busy beating my head against blow-ups of his circuit board pics