Don't forget spiral binding. It's available from most electrical/electronic suppliers and in various diameters, lengths and colours.
It may not provide the best protection in an engine bay environment, but it will really neaten dash wiring up.
The advantage is that you can unwrap it and run in extra wires or relocate them with minimum hassle.
We use miles of the stuff at work!
It's good for HiFi and AV too.
Si
