Not really sure. One looks like it's splice in the fuse box.
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Plug for a tuner like a BullyDog or something? Maybe a Scanguage or Ultragauge?
Someone installed a compass/temp mirror (I think they're Gentex) and then decided to keep it for their next ride when they sold/traded in the Xterra you now own. Hell, now you can can buy one and you're pre wired for it!