Speedo jumping & displaying 10mph to fast

Hi,My speedo needle will jump around at low speeds say 10mph any faster it then stays still with a little flicker now and again put reads 10mph faster than I am actually doing e.g. doing 50mph but the speedo is showing 60mph. Any ideas?Thanks 

Did you not just change your gearbox?
What colour cog do you have on the speedo cable?
You might need to change the cog for a different coloured one.

I change my gearbox and the speed was reading 10 mph over and I had to change from a red cog to a white one.

VW always seem to over read by 5 mph as mine did before I changed my gearbox and still over reads by 4 to 5 mph now.

No I only changed the gear select lever. Not sure what colour the cog is, I will look into it, cheers for your help

If you take the speedo cable out of the gearbox do it very carefully as you don't want the cog to fall off into the gearbox as it's not easy to get it out.

Cheers  

if its jumping about that would be cable or clocks rather than incorrect gear. but check the code on the box and the gear colour anyway while you're there

Will look into this thanks

Did you fix this issue? If so what sorted it out?Mine is doing exactly the same ☹️

KSD said

Did you fix this issue? If so what sorted it out?Mine is doing exactly the same ☹️

No but I will be looking into it this summer so will report back

I would jack the Car on both sides.
Tranny in reverse.
Ebrake full on.

As you are trying to remove your gear slightly rotate your tires back and forth, this will usually allow the Gear to release its grip on the teeth of the drive gears, and usually allows it to come out easier, (you have to loosen the cable and the gear cover bolt to allow the gear to float a bit.) It is this floating that makes your job easier.

If it is still difficult, leave it be.

Did this just start, or has it been going on.
A flaky inner cable can separate and a wire can snap and splay inside the sheath.  it will unwind then break again and the needle does its own thing.

I would change the cable first before tearing in to anything else.

Thanks for the detailed help. I cant remember if it was doing it when I got the car. But it's always done it when I put the car back together after stripping to a bare shell to restore it

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