Has anyone done this? Any experience using BP26 ECU with 92-93 ATX B6 3 Plug Harness? I thought when I did my turbo setup that it would be easy to just plug in the 2 plugs into ECU and since 4 wire TPS is wired in it would be no problem... seems I am very wrong  
  
According to 
THIS post which shows pinout of GTX, NA BP, and NA 3 plug ATX BP ECU's I have a TON of re-pinning to do. 
This explains why my BP26 ECU was not working... and why I had to use ATX BP ECU on my car (since MTX never semed to work!)