hhhmmmm...try a board search, i think some did a nice write-up before.
I think the entire guage pod needs to come out or fwd. Disconnect speedo cable first, it severely limits speedo movement. Or you can try removing the Fuel/temp guauge, then reach thru to access the nuts (2) holdingthe Speedo, then try to bring it down where the feul/temp guage was/came out.
However you do it, itsa a major PITA if your dash is 'intact'. Good luck.
-shanon