So I have these two strange wires that someone cut before I bought the Jeep, they come out of the wire loom at the back of the valve cover right above the temp sensor, the temp gauge works and it's hooked up but when the Jeep is at operating temp and I turn on the headlights the temp gauge jumps all te way around and bottoms out.

 

Not sure if the temp gauge is acuratly working if it's doing this

 

have you tried reconnecting the wires to see what happens? Just a idea

 

sorry i cant help you , but i would suggest not driving at night or just dont turn on the head lights