What do I need for a proper under-dash rewire?

I stayed with the no adhesive tape wrap under the dash. Mostly because there are sooo many tape outs. I figure that's why we still find tape wrap in brand new vehicles.
I did add the vinyl split loom at engine bay harnesses when doing the upgrades there ( electronic ignition, headlight relays, etc.. ). Mostly because it looks better than the tape wrap. Pick and pull yard is the best source for that stuff. More than enough of all different sizes, a grocery bag full, 10 bucks total. New retainers from amazon or ebay.