Why is my 97 Holden vectra speedo and tacho not working the tacho just dead but speedo vibrates very fast whilst ignition is on?

Gday mate. I have just repaired a later model vectra with the same problem. it had a dry solder join on the printed circuit of the dash board. you need to remove the instrument cluster and dismantle the cluster this can be tricky if you haven't got experience in this sort of stuff. the fault is in the connection for the ribbon to the circuit board.