speedo fault

[professor]

I've just re-built my engine and now the rev counter is affecting my speedo, so i took it back out but i carnt find anything wrong with it. The speedo just keeps jumping about like a cheap french car!!! Anyone got any idears?

[Mylee]

Sounds like a bent or damaged cable, that would cause the needle to jump and flick about, but I'm not sure if the Beat has a cable driven speedo.

[Steve_M]

Beat speedo is electric sensor on gearbox.

Could you have disturbed connector on gearbox or damaged wiring in that area.

Also possible engine earth could cause problems like this.

[professor]

I,ve just put the engine back in so i will look over all the wireing and sensor on the gearbox, coz i did take it off. I noticed the weiredest thing earler, when i rev the car even if im not moveing the speedo flickers!!! Thanks