my speedo is going cookoo

[allerston]

season greeting! everyone let me cut a long story short i was at a stop street and my speedo need was at 100 kmh then it dropped to 60 kmh and then it moved back up .and when i switched my car off the needle was jumping up and down.
did anyone have this problem and what did you do to repair it .

thanks guys

[632 Regal]

almost sounds like the capacitors in the cluster... wait for better replies.

[e34.535i.sport]

I've had this problem for some time. Mine tends to not register my speed for a while then will jump straight up to whatever speed I'm doing at the time! At first I was blaming the speed sensor in the diff but I have found that if I flick the dash with my finger when the speedo isn't working it will jump into life - so it's something in the dash that must be playing up. Also it is sometimes quite erratic and just does a jump up and down while I'm stationary!