Let me explain some of my confusion here about teh wiring harness so you can see what I'm facing and hopefully someone that has does the swap with a Cressida harness can chime in and help me out.....

Please remember that the info below is from what I remember from dealing with it from about 6:00pm until 12:30am last night... So its probably close but don't take it as the truth if I called somethign wrong or didn't remember the exact number of wire in a plug.

See for a Supra swap you have three main connectors. C1, B1 and M1. C1 is suppose to have 5 wires and is next to the plenum. B1 has like 22 wires and is next to the ECU and M1 has like 6 wires and is next to the ECU. That is for the Supra harness. The cressida is different! the connector next to the plenum is B1 and has 3 wires. then the large plug that is suppose too have 22 wire next to the ECU is now actually two plugs B2 (12 wires) & B3 (10 wires) on the cressida harness. and the supra M1 plug on the cressida is called C1. Also note that these connectors are different shapes from teh cressida harness to teh supra harness.

So you can se how this is confusing.... not only did the names and shapes of the plugs change but a couple of them just switched names.....

Supra(C1) = Cressida(B1)
Supra(B1) = Cressida(B2 & B3)
Supra(M1) = Cressida(C1)

So after I figured that out then I looked at my supra info and compared a specific wire in the supra info to my cressida info for the symiliar plug and then seen if I could find that wire on my harness. in doing this I started to understand how to read the schematics quicker and easier. also in this process I had to strip the tape off several areas of the harness to trace the wires to try to understand where they went and why. So by the end of the night I was just flipping thorough the cressida manual looking for plug designations (like #7 & #12 terminal on B3 connection goes to the neutral start switch) and then if the wires matched the color and traced to approximately the correct location, I would label them with their actual function so when I got read to cut and splice I know what I was doing. But one part that I'm really confused on is I'm not sure what to do with one of the plugs coming out of the ECU since it goes into the main bundle under the cressida dash and not to the main engine harness like the other two plug coming out of the ECU.....