lil-red-89

Ok so I just bought this 1997 Nissan 240 and when I bought it I knew the fuel gauze wasn't working but wasn't sure why. So today I pulled the top junction plate and lock ring off... Reached in the tanks and removed the fuel pump and sending unit ( what a pain in the ass!) so finally I get it out and see 2 things that automatically catch my eye. 1. There was a broken wire which looked to be a ground that was soldered to the side of what looked to be a resistor (black wire) and 2. There were 2 plugs for the fuel sending unit and only one of them was plugged into something, was this done from factory so the sending unit could be used for 2 different cars? I don't see this being the case.

Can some one tell me what the tan 3 wire plug is supposed to go to? The black plug goes to the bottom of the plastic circle plate, but the tan 3 wire plug I can't seem to figure it out? Thanks in advance...