Nitrous plumbing A1A...??..

You could go 25n/25f if you feel your happier with that, you won't have to concern yourself about retards too much either, perhaps 2 deg is enough, more if you go cleaner. I had 1 main arming switch, then 1 switch for the seperate fuel pump for NO2 petrol, and then a micro on carb for WOT off the line. A steering wheel button is perhaps your best way as I doubt you'll be hitting it off the bat anywhere, even once you get used to it all being a stick car. Having a fuel pressure guage thats visible in front of you isn't a bad idea, I had 2 on the cowl. The thing you need to watch in a "race" situation is if your in 2nd say and you want to hit it, make sure your at 4000 before you do, downside to that is it'll spin to 7k quite fast depending on how much N you got in it.
When I ran my 9 in the 440 car I hit it with a 175 big shot off the line, wasn't ready for it, never done it before and it almost caught me out, it went to 7100rpm on the hit, managed to hit 2nd but it trapped at 7400rpm, crapped the life out of me with 6-pack rods/pistons in there:eek: