I remember seeing a mission or requesting specifically 4 or 5 conductors. But for the life of me, I cant figure out what it was. No notes. Can anyone please help me?

You need a conductor for the Rock-It Launcher I think.

You also need 2 to fix the food machine at Camp McCarren if you don't have 90 repair.

Sensor modules are needed in some crafted explosives.

Sensors are used to fix ED-E, to make bottlecap mines & powder charges.