Fuel tank sending unit

[SilentRaven]

does anyone know what the four wires on the connector of the sending unit go to???? i just dropped my tank to check out my sending unit, and i noticed that two of the wires from the sending unit side of the connector are disconnected, i believe they are yellow, and yellow/black, does anyone know what these hook to??

 

[djmadness]

According to the 1987 (Should be the same) factory wiring diagram the Yellow/Black goes to a low fluid monitor solid state relay. I dont see the other wire on the factory or KLM wiring diagrams.
I have to drop my tank and replace my sending unit too. How much of a chore is this?