if you bought the harness then its should plug straight up
you may need to set the afm type tho, should be easy enough to find the info tho
the neo may even just have a menu and you tell it what motor (not sure, just a guess)
i put an old school safc on my r32, it reads the afm voltage then adjusts it up or down a percentage - your best to do this on a dyno but you can probably pull a few % of fuel out up the rpm range
or grab a wideband and get it up the exhaust and tune it yourself