Dashboard dies, all warning lights come on, all needles go to zero

Generic warning light - see the link below...

https://www.drivingtesttips.biz/dashboard-warning-lights/fiat-dashboard-warning-lights/fiat-punto-dashboard-warning-lights.html

common thing is speed sensor

What year,make and model is this ? also the x2 light is on and what symbol was the other yellow light?

A possible alternator failure. It would have shown a battery charging warning light on the dash before failure if this is the case.
Restart with a donor battery and check dashboard for charge warning indicator. If illuminated, then replace alternator.

Symptoms point to the cluster microprocessor. How was it proven? See diagram below.

It may be overdue for a scheduled tune-up, oil change, etc.

a new battery will keep the volts up for a while. the light warns that there is a problem, usually its the alternator, one way to check is to loosen the positive battery cable, a little, start the car and disconnect the positive cable if the car dies the alternator is bad if it still runs its probably ok

sound like you have a lose connection it could be the cables on to the dash or the socket it fits to. you would need to remove the dash and clean the connection and re fit it. if you push on the dash does it stop. ? just check this first as some times its just a tiny amount of play in the connections that's the problem .

So many lame responses...I went through this same experience and can tell you in my case it was the alternator. All of the warning lights such as the ABS light, airbag light, the warning about the brakes are all because the alternator is not providing the DC voltage all of the car's sophisticated electronics need to correctly monitor these subsystems' status. Mine left me high and dry by the side of Interstate 5 needing a tow. The low battery warning was off and on for about an hour before all of the other warning lights came on, and then about 5 minutes later every needle on the dash went to zero and the car died. After sitting waiting for the tow, it did start up again, but we got it towed to a dealer (thank god it got us within 8 miles of a dealer! the first warnings started when we were in the sticks) who diagnosed it as an alternator. $1200 and two days later and all is well again.