Well I've been trying to look for which wire the gray one on the gauge goes to on my 97 civic ecu? Anyone have a clue where I can find it?(please unneccesary comments about getting a wideband not being included would be highly appreciated)

 

do you want to run a wire to under your hood or inside the car?

ps.
get a wideband

 

Its gonna go to my ecu, the ecu is in my car, so yeah, in my car...

 

Regular A/F gauges like autometer are useless.

Don't even bother installing it. Just put is on your dash. It will be just as useful.

 

just plug it up to the signal wire of your o2...same ****.