1loud2k6sw

ok guys ive searched here and everywhere else and ive got a narrowbad a/f gauge. i know everybody is pushing widebands because theyre more accurate but for now im gonna use this til i can aford a wideband. all i want to know isif the motor is running rich or lean. i know this gauge will do that because it worked on my 02 eclipse. it danced aroun and made pretty lights and stuff. but i need to know which wire to tap forthe signal. i cant find it anywhere. thanks