Originally Posted by RevHeadRon
The XD onwards has an electronic speedo and sender.
You can turn a small screw in the back of the speedo that will give you about +/- 40km/h of adjustment. This saves having to fit a different speedo cog which may not be exact anyway.
Just borrow a handheld GPS, cruise at 100km/h on the freeway and adjust the screw until speedo reads correctly.
You may need to pull off the small factory calibration sticker which covers the hole.
I'm guessing BigPapa351 has an older mechanical setup with drive cable.