Rigid A-pillar install help!!!

Hey guys so I'm finishing up the install on my Rigid A-pillars.

Put the @sdhq_offroad a-pillar mounts on which are SWEEEEET! And durable as can be.

Mounted the lights, ran the wiring it came with and this is where I need help. I installed it the way the instructions said with the 3 prong switch it came with but I want to use my OEM switch from air on board but have never installed a relay or done this type of install and am lost on what I'll need equipment wise and what to cut and crimp.

I have the @ragofabrication universal relay harness that I will be mounting and using until I get the remainder (5 more lights) of my lighting set up.

So what type of relay do I need, 4 or 5 pin?

Do I need an add a fuse or in line fuse? (I heard guys splicing into an adjacent switch like tow haul)

And how do I actually wire everything up.

Please help with pictures and detailed instructions. I've looked at numerous vids on YouTube and no one explains it quite clearly.