temp gauge not working

[mexlokote]

also when i went to autozone to buy the new temp sender unit, they askit was a gauge or light and i told them a gauge so they gave me the temp sender unit and i came home and tried to put it on and it was too big i wouldnt fit so i went back to autozone and i asked and they gave me the light sending unit, and i came home and it fit perfect, i dnt know if autozone has it mixed up or something is going on with my truck because when i first bought it not running, i got it running and one time it overheated and the gauge worked perfectly, this happened after i did a rebuild of engine i unhooked many wires,
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