Need nitrous help!
 

I have a few questions about this before I install my nitrous. I have a zex wet kit that goes in through the intake. First off, do I need high octane fuel? And how important is it, would it be bad if I just used regular unleaded? And how do you record your retard timing? And also, how do you run the lines under your car without scraping them? (my car is very low). And finally, what gauges do you need to be reasonably safe (what can you do without, I'm not trying to blow all my money on this)? Any help is greatly appreciated!