qg18de a/f ratio gauge

[portmore_king]

Hey guys, This is my first time on this forum so just want to say whats up.I have a question. I just bought an a/f ratio gauge for my 04 1.8 and the instructions says to install the signal wire directly to the ecm. Does anyone have a detailed install for this or is able to tell me which color the signal wire is on the ecm.

[Twilight sentra tuner]

u could wire it up to one of oxygen sensors. thats what i did. it works and everything. just get a fsm on the car to find out which wire in the oxygen sensor is the signal wire.