Sounds like a loose connection on either live or earth. Get price of auto electrician to test and find out or try
1. fuses
2. Locate the feed to the dash instrument cluster and see if the cable/s have come off the dashboard terminals.
If you haven't a manual on the model phone your local library some have workshop manuals for cars you can look up the faults page and it may give some idea what's wrong.
Rob
February 2008