Fiat punto speedo not working

hya i had the same problem with mine one day it was working then while driving it just went off

if the speedo is electrics ratha than speedo cable then it is the speedo sensor that bolts into the gearbox it should have a connector up from the sensor cable (blue cable) unclip it from there and unbolt i bought sensor from local scrapyard for £10 and replaced it took 5 min easy job hope this helps