There are two wires going to the alternator besides the jumble of battery wires that attach to the output post on the back, and they are the brown/yellow and brown wires. The brown/yellow wire is the "Battery Light" wire and the solid brown wire is the "Sense" wire. I bought the GM Delco connector that plugs into the alternator in the bubble pack at the auto parts store. Its a white plastic connector with one white wire and one red wire and is keyed so it only fits one way in the alternator. I soldered the brown/yellow wire to the white wire that attaches to terminal #1 on the alternator and slid some shrink tubing over the connection. I then soldered the brown "Sense" wire to the red wire that attaches to terminal #2 on the alternator and slid some shrink tubing over that connection.
The belt tensioning "J" bracket that was on the car was reused with this alternator. Its amazing. Now the needle never goes below 13 volts even with the A/C on full blast. Before, the needle always went down to 10 volts if I had to sit at a traffic light.