I need to rewire the engine compartment

I have a question and hopefully someone can help me out. I have to rewire the entire engine compartment. My wires are fried. I just got a new ECU and now I am trying to figure out what kind of wire harness I need. Online I’m finding Anywhere from 21 to 23 circuit. Does anyone know what I need for a 2006 3.5 L.
Any advice would be greatly appreciated.

Have a wonderful and blessed Memorial day weekend. And to those who have served,
Thank you for your service