98's and some 99's had a problem with the self docking connectors behind the gauge panel. Pull the panel, clean the pins and in my case I 'tweaked' them a bit so they were not so straight and made better contact. Don't bend em too much or they won't seat right and you may break one....
You problem is usually included with 'and all my gauges went to -0-, speedo quite and odometer stopped working'....