it's easy to cut with scissors but the ends fray as soon as you handle them, so you have to use a lighter to melt the ends to keep it all together. if you've got a bigger project you can use a hot knife to cut it, which will prevent fraying, and if you can access the ends of the wires you can use some heat-shrink tubing to clean up the ends. (i could have used electrical tape - what i found on my harness was that the plastic sheath had almost entirely crumbled away except for where the electrical tape had been wrapped around it.)
i can't comment on the effectiveness of this given that oil probably soaks through the techflex if you leave it in there long enough. also, it's kind of pointless for aesthetics since the injector and plug wires aren't normally visible anyway. but it may at least protect the wires from abrasion, it was kind of fun looming up the wires, and i know it looks nice inside, which, i'm told, is what counts.
- plug wires before
- plug wires after
- injector wires before
- injector wires after
- annnnnnd you can't see any of it.
if you want to take a crack at it, i used Techflex Flexo F6 with a 1/4" inner diameter. you'd be surprised how much wire you can stuff into a quarter inch.
http://www.ebay.com/itm/350999178330