According to my dad and brother that drives the car it guage never shows running hot. The guage does not have a red mark for the danger mark but will get up to about where the red mark starts on the guages that do.
My brother replaced the relay but I do think that there are 4 terminals there. 220 degrees on a guage that doesn't have numbers to show you what temperture just a line the guage arm let you indicate by would be over toward hot a good distance wouldn't it ?
Here are the wire colors that you wanted me to let you know about. The three big ones are orange, red and green. The smaller wire is a green too but a little bit lighter green than the other. The RED and ORANGE wires are the 2 hot wires.
My brother said he jumped from one of the hot wires to the one that goes to the cooling fan and it didn't make it work.
My dad had someone that works in a local garage come by the his house and look at it and he thinks they might have gotten a new coolant sensor that was made for lights and not guages. But if you go to autozone website it only shows one.