I think you mean the tps (throttle position sensor/switch)
There are 2 types on nissans. Usually a small black box on the side of the throttle body with 2 3-pin plugs on it. One is a switch to tell it then its at full throttle or idle, and the other is a constantly variable resistor, to tell the ecu how much accelerator is being used.
If your new loom does not have it and your running the de ecu, then dont worry about it