Re: automatic light sensor not working properly
The 97 had a module built into the headlamp switch and a sensor that detected ambient light, an amplifier and a relay in the fuse box controlled by the sensor amplified voltage.
So, three things: the relay, the sensor/amplifier module, and the headlamp switch. Plus all the appropriate fuses.
If you really want the details, try to find the EVTM manual for your car. It is definitely worth its cost. Electrical Vacuum Troubleshooting Manual