does this gauge come w/ its own o2 sensor. the reason i ask is i bought the greddy warning gauges and the a/f came w/ its own o2 sensor. all you have to do is find the signal wire off you current o2 sensor if it doesn't come w/ o2. just use a multi meter to find the sidnal wire. if it does come w/ 4 wire o2 install new o2 sensor and plug it into gauge connector the use the signal wire from vehicle o2 harness and sauter ir into the signal wire of the new o2 sensor so that the ecu still gets the signal. i don't know if this helps you at all, but i was just trying to give a little advice incase you can not find the diagram.
i don't remember what color it was but all you have to do is use a multi meter and turn the key on w/ the engine off and i beleive use the one w/ no current. depending on when yuo want to hook it up i can look at my talon tonight and see wich wire it was.
2G owners need to connect to the ECU wiring in order to monitor A/F ratios. You can find the correct wire by reading the hawaii.dsm.org at http://hawaii.dsm.org/howto/afguage2g.html
pinout # 76! top plug, middle white wire (very middle) on the ecu. if you look at the plug, the catch that you have to squeeze to take out the plug.. its the very middle on that side of the plug.. check out the diagram of the safc installation and youll see what i mean
top plug, middle white wire (very middle) on the ecu. if you look at the plug, the catch that you have to squeeze to take out the plug.. its the very middle on that side of the plug.. check out the diagram of the safc installation and youll see what i mean 
