That's great work, IPO. I started trying to do this with my TT conversion, but it looked to be too much work to get the harness to work with the resistor pack, too much custom wiring, and I was pressed for time anyway. I ended up just putting some 5.6Ohm resistors in series with each injector. So far, so good.
With regard to the different ECU pins, check Jeff's page, and also this spreadsheet listing the differences between N/A and TT 1st gen harnesses. -->
http://www.stealth316.com/misc/3s_19...3_ecu_pins.xls
I'm using the N/A harness with the TT ECU, and it was not hard to modify the ECU plugs.