I have almost identical part & location. 1/8" fittings from/for runner (i recall?). I used off the shelf pneumatic dividing block (name?). Keep volumes as small as possible. For map i use a small filter in line to clear all pulsations away - i like ecu to see nice trace. I don't have b/booster so dunno if that changes picture. + 1 outlet is for pop off valve (forced induction).
hth