Anyone know what kind of wiring harness I should use for these?

This probably sounds stupid, but how would I connect the switch with just a inline fuse?
 
The fuse will have 2 sides one side goes twoards the battery other twoards the switch.just cut the line where you want the switch and hook one side twoards the fuse and the other twoards the device and your in the game.remember to use the correct guage wire for the amperage you'll be using
 
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