EFI relay is the one in the middle... Same relay as the main and can be found in ae82 / ae92's etc. If you take the plugs off the numbers are printed on the pins.

You'll need to add the high amp input + output wire to the fuse box. One i'm pretty sure is on the orange connector on the side and the other is the far right plug on the top. From memory the output is on the side and the input on the top.

If you aren't in a rush i'll be doing another one next wekend so i'll let you know.