Have you determined for sure if u need these? Your car is OBD1 so it's easy to pull the codes without a scanner or a diagnostic port, provided you haven't reset the ECU yet.
Later on when you have time, you can wire in a diagnostic port from any other OBD1 Toyota vehicle using the colour codes and pinouts whown below. Take a Sunday afternoon and do it yourself if you want.
Go here and see which ECU u have and the pinouts for such.
http://www.toyotagtturbo.com/forums/sho ... ut-DiagramIf you're unsure, just unscrew the top plate of the ECU. The pinouts are on the board.
Connect one end of a normal T5 bulb or 12V LED to ignition positive and the other to pin "W" (this is now your "Check Engine Light" or warning light) and connect pins TE1 and E1. Turn the key to the ignition on position and count the flashes from the bulb.
NOTE: you have to do this without disconnecting the ECU, so wou won't erase the error codes.
See how to read and decipher error codes here:

Marco from Tropojë wrote: Good luck.