i have a bad sensor in my jeep i believe its called a coolant temp switch the smaller cooling fan isnt working. ive already checked the fan i unplugged the sensor and jumped directly with a piece of speaker wire and the fan was working so i know the fan is still good my question is would the same sensor/switch out of a 1990 cherokee work as a replacement as i have located a guy with parts from a 90 also will the taillight/brakelight fit my 89 aswell?? thanks