Technical Erratic speedometer. Bad grounds?

[MaxPowerPunto]

having an issue with the speedometer, it sometimes reads fine but when hitting any bumps in the road it goes mad either to nothing or max speed or just sweeps all over, any idea what the solution could be?

 

[Greasytrucker]

The Usual Speedo Problems - MK1 Punto | FIAT Punto (Mk1)

Hi everyone, first post, and guess what, some issues! Have recently bought a '99 60sx and the speedo has started to play up. Have had a trawl through the forums and it seems that this is a fairly common set of problems - the speedo sits at 20, and sometimes goes to 120 and above with the...

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