1)the pins for this can be different locations on the ecu depending on which ecu part number
2) thats part of the cars wiring to ecu in the ae82 ae92 and short loom in the ae86 , five pins there is a wiring diagram on toolmods i posted it can be wired in without the cars wiring
3) thats why i asked which loom your had ? you are just wanting the power for the ecu ?
4) front the fuse box has a efi main outlet pin , its the 6.5mm terminal that isnt used due to it being a 4ac .