High temp wire loom - what I learned

I have a lot of plastic decay, so I wanted to replace the wire loom around parts of the harness, notably around the thermostat and for the reverse light sensor over the transmission. I was shocked at how deteriorated the existing plastic was, so I did a bit of research and figured out a few things.

First, there is standard plastic wire loom:

This is not particularly heat-tolerant and will decay.

Source...

High temp wire loom - what I learned