20vt wiring questions

Hi Building a 20vt in to a mk1 golf running a ihi turbo using the standard VW ecu, getting stuck on wiring need some help.

1ose anyone have a wiring diagram form the 1.8t engine to the ecu so I can cut out the wires I do not need.

2: Do I have to use the Maf sensor and the n75 valve if I am using the standard ecu, or am I better off look at an after market ecu to get around these?

3: also what do these two little gadgets do? And are they needed?