oooh...spiral wrap. <shudder> I can't stand the stuff!
The tape I'm using is all temporary while I lay the harness out. Once I'm ready to go I recover the harness with Expandable covering and heatshrink tubing. All of my harnesses are made permanent, in the sense that I can't easily add or subtract circuits down the road. But the Expandable covering is all reusable, so if you don't mind pulling a harness apart it's fairly simple. I don't have a good photo of any harnesses I've done, but the following shows the stuff in use:
I'm not overly concerned about "forgetting" any circuits, I could basically open the notebook from my Audi Rally car and know exactly what I need to run. Just the location in the car is perhaps different
-Dave