oops, just saw that you need the motor, not the control box.
if you don't have the parts already, I'd say that you are better off installing a cable-controlled injection control. Pretty simple--- just push to start, pull 1/2 way to drive, pull to kill.
Or you could install a simple solenoid to cut the fuel when the key is removed.
All that the EDIC does is
1) adds extra fuel when starting
2) stops adding extra fuel once started
3) stops fuel to stop motor if oil pressure is too low
4) stops fuel to stop motor if key is turned to "off"
For a lot less $$ than the toyota edic parts, you can make a system that will do just about the same stuff, just using a cable, a relay, and a solenoid.