my guages arent working!

[1972 C-10]

Ok so im stumped. I had my guage cluster out to replace the washer pump and when i put it back in, none of the electric guages seem to work. The fuel just reads half tank when it should read full and the temp reads 1/4 when the engine is cold and doesnt move when the engine heats up either. I took the dash back out and inspected all the wires connections and i cant find anything. I thought maybe ground, but im not sure if thats it, because the lights in the dash still work, its just the guages that arent working. Any help would be awsome Thanks.

-corey