Figured I'd share my experience getting 2.4 going on my 140 (which obviously had no ECU/fuel pump wiring before this swap). The cool thing is that my 140 ignition switch has the same pinout as the 2.4 switch, it seems.
Turns out I was using am '89 harness with a 9-pin connector by the computers. The blue wire that everyone talks about to power the system relay is actually red/black on an 89 harness. (still pin 35 on the ECU). This gets plugged into pin 15 on the ignition switch for switched/cranking power.
I ran the thicker red/yellow wire from that connector to an empty spot on my 140 fuse block. I wired my fuel pump to the other side of this fuse. I also connected the thinner red/yellow wire to the other side of this fuse for the O2 heater. This mimics the stock set up, based on the diagrams. Now the system relay primes the fuel pumps and O2, then powers them when cranking/running.
The blue/yellow wire from the 9-pin connector gets input that the starter is moving. The wiring to actually activate the starter is done through the gray connector on the engine side of the firewall. I connected the 9-pin blue/yellow to pin 50 of the ignition switch (power while cranking).
At this point, I don't have an intake manifold on the car, but i have checked all the LH systems. I have spark, fuel coming out of the line when priming and cranking, and doing the Function 1 test on pins 2 and 6 of the diagnostic unit shows me 1-1-1 codes, indicating that all is in order.
Thanks for the help, everybody.