pbrx7

my efi to carb conversion is almost complete. just a few bugs to work out in the morning. i'm very happy with the results so far. my question for you all is this. without a computer, what is needed to operate or control a turbo? i've never had a turbo and am clueless. also, what size turbo do you need to run very low boost, maybe 4 to 5 lbs, and keep it on the lower side of the rpm range?price of turbo? any one with info please put your two cents in. thanks, paul.