battery connected ignition on check gauges staying on & motor runs rough on 1994 Chevrolet Cavalier

i have been rebuilding this car and am wondering if I have messed up the computer some how......When the batter is connected and the ignition switch is on, the check gauges are staying on and the motor is running very rough

Asked by for the 1994 Chevrolet Cavalier
What's wrong with the gauge, not working. Probably nothing to do with the running of the engine.