Fuel, air and brake lines

Just looking for some ideas for securing all my different lines to my frame rails. The frame has a back half with 4x2 rails. I'm more concerned with function than anything else. So what are you guys using?

 these are what i normally use.  can usually find em at your neighborhood hardware store if you look in the electricians dept

 I was checking these out. Is 1/8" thick rails thick enough to tap or would I have to weld in something thicker to tap or maybe just a nut?

those are cool.  you could prolly just use self tapping screws and be just fine