i am going to be making a braided hose for a turbo feed for a t3 turbo using aeroquip hose and fittings.

can anyone tell me the best bore to use for the hose is it -3 or -4? and also what thread is the fitting into a bailey turbo oil feed filter and also a ford CVH/zetec oil pressure switch as i will be using a hole where one of the plugs for the oil way go and that uses the same thread as the oil pressure switch.