Hey people, first post on here as a newbie to the site so bare with me!

I am currently in the middle of building a 300tdi tray back and I am just about to tackle the rear lights. The problem is I don't want to use the old wiring loom as there is a lot of it!! I was thinking about pulling the whole loom out and starting again making my own circuit for the dash dails and lights. Has anyone done this before? If so any tips!!!!
Thanks jack.