can the MS control Boost? and I have a narrow band air/fuel gauge if i hook it up in my RX will it tell me if I am going lean? I don't want to put it in unless it will tell me when I am running lean.

Narrowband will give you a general idea, but its not really any good for tuning.

I'm not going to use the narrow band for tuning, just untill I get the MS and a wideband (prolly get both at the same time)

would it be better for the MS to control boost, or use a(nother?) EBC (like the greddy profec