GF's V2 in the back yard & a 97 GTB stopping the grass from growing, needs stuff, and a dereg TT Sedan to play with I had to take a guess how old it is
I'm new here too but did you try the FAQ in the menu? the first "mega thread" had 7 results for Pinouts
this one in particular might help the most?
http://homepages.ihug.co.nz/~chrisarg/ClubSub/tech/ecu/ECU Pinouts BC5 BG5a WRX (4 plug).pdf
new list + 2 more (I have lost my ability to edit my posts too)
https://www.subaru.co.nz/wrx25/#/boards/subaru-wrx/entries/subaru-enrtry-cee79ee8-40e6-415e-a6b7-d633a0e386d8/share
https://www.subaru.co.nz/wrx25/#/boards/subaru-wrx/entries/subaru-enrtry-3ba6276a-05d7-4ff8-972f-282d2df21891/share
yo uget to 'revote' every 24 hours so click on everyone & vote for "ClubSUB"