Dodgy Speedo.

[Rushy21]

Hey guys, as of late my speedo has been a bit "temporary" in the way it wants to work.
Sometimes when I take off it doesn't work at all, and when I get to 60 or 80, it shoots straight up to the correct speed.
Other times it sits on 0 regardless of my speed until I give the top of the dash one solid thump and then it begins to work perfectly.

Faulty connection maybe?

[wolverine]

You can check all connections from speed sensor through to cluster but the speed sensor might be failing, been there done that. A search should find it.