Anyone know what's the best wiring loom to use for DX (EK) engine harness also how much and how thick?

 

There are a number of "looms" out there, stock on Honda/Acura is black split loom of diff. sizes, almost always also covered with one layer of electrical tape, [or partly covered or covered at the ends/junction.

Split loom is also available in a number of colors.

There is also a split loom that looks "old-school", we use it when wiring hot rods and classic cars.

The most common when making/cleaning up harness is "back-taping" it is time consuming but makes for the "thinnest" harnesses.

Process is to wrap the harness with electrical tape, but sticky side out, then go "back" over it with sticky side in, so sticky sides together.

This makes for a thin harness, and a very flexible harness as the s5tick part of tape ins not sticking to the wiring.

This can also be done with friction tape, [hockey tape] or any color of electrical tape. 94