ap2 s2000


Im using an aem ems v2 with a fail safe gauge+wideband.
my problem is they ask to splice into my 02 feedback which is the white/yellow wire at the ecu,I wired the white wire to the 02 fb input. Additionaly I have a blue, grey, brown and yellow wire. I never wired in the brown wire.
is the brown wire the reason why my 02 fb is at full lean in my aemtuner, and the car bogs when under throttle. and barely runs. First time wiring a wide band gauge.
Im waiting for a d plug for the aem v2 so hence why I haven't wired it.
also I am not using a boost solenoid
would the yellow wire be needed, and if so where would I wire it to
trying to get educated here.

d plug for aem ems v2


aem failsafe gauge wiring diagram