Tape vs split loom

When you say you are working under that dash, what is your position.
Are the front seats out so you can be relatively comfortable?
Or are you a contortionist with soldering iron laying on your chest between uses and dripping solder into your eyes over your head?
These things make a difference.
If the previous owner was a butcher, why not use extra wire in your repairs?
Work it outside the dash and then secure it when complete.
That makes the most sense to me.
No need to do a factory job.
They made the harness to fit the car during assembly.
No extra wire.
That's not you.


Regarding the question in this thread.
And since this is a new specialty for you.
I think there are two reasons for putting something on the wire in your car.
1. Protection from physical damage.
2. Keeping the wire clean.
I'd say whatever works.

Particularly under the hood where the wire sufferers the most, I like to separate my wire runs by application.
I wrap them separately.
Again, not like the factory.
But they had different reasons for doing it all in one harness.