Filter minder put on my Ram Hemi airbox

[NashNative]

I assume you have to wire it into switched 12V somehow? Does it come with a harness for that purpose?

That's correct...it comes with a pigtail harness for power and grounding: https://www.cumminsfiltration.com/sites/default/files/fleetguardfit/resources/LT36735_REV_A.pdf