hey man, first ya gotta remove the speedo cable, sure you did that already though. remove the bolt completely that retains the speedo cable. there is a slip in *collar* that the speedo cable goes into right there. will have to take pliers n remove that *collar* then the speedo gears ""SHOULD"" fall right out.
Do unto others as you want done to you!
If you pack it in, pack it out!