Annoying clicking behind instrument panel, help!

Hello!

I recently took my instrument panel off and have developed a number of faults since putting it back on. I think I can fix most of them however I have a really annoying clicking noise which speeds up as the car does, so I think it is something to do with the speedo.

Does anyone know what might cause this?

Any help greatly appreciated,

Mark

Does anyone know how to fix it? Or what the connections to the back should be? I have a 1991 defender 90 2.5 n/a petrol
Thank you

Id imagine that you havent got the speedo cable in the back of the clocks right/.straight co the cables catching , pull your clocks forward a bit and have a peek behind to see if the cables in all the way .