Here's a real pic to help you out:
Your ECU can be seen in the top right corner. The I12 plug is the blue plug in this pic (as referenced in the TRD EBC install manual page 4, step 3). Pin 2 should be the purple/red wire (top, left) Per the TRD manual, the colors may vary, but pin location stays the same regardless of model year.
As a side note, my car is a manual and i never installed the EBC.
'99 S/C'd 5spd: 6psi-KYB/Intrax-Kaminari-Renova- 2.5in w/TRD muffler-full Injen CAI w/crisp-mongo filter-Walbro 190-305cc-Jim's fuel-torque rod-8mm Magnecore-EGR delete-ACT 6-puck-AEM wideband-SAFC2-Supra/ES300 F+R brake conversion