I am going to get a fuel pressure safety swith for my n20 kit and was wondering do I get the 4an or 6an fitting? Is this all I will need, or will I need a manifold to? I really don't understand what the manifold does.
http://www.harrisspeedworks.com/shop/home.php?cat=313

 

with their kit youll need a -4an, ive got one thats barely used...

 

I would get the 4AN fitting and the manifold. You will need the manifold because it mounts the fuel pressure safety switch and puts it in series in the fuel line.

 

The one I gave a link to, doesnt it have one with it? If not, what is the little blue thing in the pic?

 

Sorry, I didn't check your link, that is everything you need right there, the manifold and the switch.

 

Awesome, thanks for your help.