Hi all i have a 2.0 dohc efi sierra and i would like to put a turbo on it its no my daily driver just a classic used at weekends iv been doing alot of research and just havent been able to find anyone to help

i no turbo technics used to build a kit but no longer do so i would just like to make my own
I have the basic idea with manifold turbo intercooler and pipeing just cant get my head around the fueling and mapping side of it

iv heard alot o people using a 5th injector and upgraded map sensor and others using a aftermarket ecu and getting it mapped
anyone have any idea help much aprechianted