Hi there,I got a brava 1.6 x reg(2000) sx.the other day i was driving when the speedometer needle went shot down to zero then it went back up to the original speed that i was doing.its done this a couple of times when i was driving.i want to know is it a cable fault or is the speedo run by electric if you know what i mean .if so where is the part on the car.many thanx Brian