fuel and gauges

First, check the fuses. If that's no help, it's possible that there's a voltage controller in back of the the dash gauge panel, installed into the printed (I assume) circuit on the back of the gauges. It may have failed. find a Geo specialist or an auto electrical shop, should be an easy fix. If you want to find a specialist, here's a directory link for you: https://repairpal.com/geo-repair-in-springfield-ohio