Fuel pump swap, need some help

[Vandurable]

I have my tank sitting on the ground, waiting for the new pump to go in. All my fuel lines are disconnected but I noticed the harness has 3 wires while my replacement pump only has 2. I figured one is for the gauge but how do I not ruin it so my gauge will still work

[MountainManJoe]

Again , electrical schematics are in the service info link I gave you. Maybe you bought a pump assembly without the level sensor? If yes you'll have to take it off the old one.