Ls alt wiring

[Daaaanz67]

Currently installing an 06 ls in my 69 c/10 and was wondering were to hook up the brown wire on my truck That tells my gauge if the alternator is charging. The alt that came on my motor has two wires brown and gray then it has the large red wire that goes to bat+. I'm thinking brown to brown also does it need a resistor in between the connections just not real sure and dont want to burn up a good alt or the truck.
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