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Message: <blockquote data-quote="Mustang5L5" data-source="post: 1544685" data-attributes="member: 30520">I have this same setup on my Foxbody. Literally plug into the stock ECU connector, and run a vac line for the MAP sensor on the ECU.   If oyu do a single wide-band you can make a adapter harness and just plug it into the stock O2 harness.   I'm running dual wide-bands so I made a separate harness to run back to the ECU.    Comes with a canned tune to get you up and running.  Decent forum and FB group for support.  When it comes to tuning you are own you own a bit, but there are folks that know what they are doing that can set up a tune for you. Holley is a bit more user-friendly and they offer great support.  You will need to change out the entire harness however.</blockquote>