slammed91-hatch

alright, i have a ls motor in my 91 hatch. the motor is all running fine now. But i have a very weird wiring situation. when I turn the blinkers on the light for the brights flashes along with both blinkers on my gauge cluster and the tach bounces and the temp gauge goes up to H. Does anybody know what wires that all of these would have in common that could be bad? I don't know if i accidentally cut these or disconnected them or what happened. please let me know.