When installing a AEM uego wideband guage and sensor . Do I just splice into pin#76 or just run the wire so it connected comin from the EMS to the wideband and not use the wire going to the factory O2 sensor when using to O2 feed back feature? jus wait to be sure

 

and would it be fine if both were connected

 

You can splice into it, de-pin the original white wire in pin 76 and re-pin your o2 output wire into it, cut the wire between the ecu and the engine harness and tie into it, etc. Many ways to skit the cat here. Make sure you follow the instructions on setting up the 02 gain to make sure the Gauge display and the EMS jive with each other.

 

You CANNOT leave the stock o2 sensor connected in anyway if you have a wideband connected.