There is only one wire and it should be black.
We need to know what sending unit you are asking about, there are several.
A tan/white wire goes from the sending unit to the fuel gauge typically on a (example) 1985 Chevrolet Silverado 305 tbi.
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pink wire is the hot to the sending unit on my 84 CJ7
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Should be a valve like a tire valve on one of the lines near compressor. Use the one with a blue color code (low pressure side)
Green is the hot wire for my 2004 Chevy Colorado.
red
Blue.