[Dirty Harry]

I used the split tubing. I think black is the only color I like. I used some little square plastic blocks with a slot in them to affix the wire to. I got them either at an auto parts store or Radio Shack. I don't remember. They had double sided tape to attach them to the underside of the fenders, out of sight. That adhesive failed when exposed to the underhood temperatures. So did JB Weld. I next tried Liquid Nails construction adhesive to mount the blocks out of sight under the fenders. It worked great. I simply attached my wire bundles to the blocks with a zip tie and it has worked for 17 years.