Sorry, I'm a little bit late with the answer, but anyway it could help to another one with the same doubt.
ME7.5 is the ECU used by the Audi TT, you could find the Audi TT System Wiring Diagrams googling a little, for example:
http://www.mitchell-auto.ru/UserFiles/File/wiring-diagrams/audi-wd/2001-audi-tt-wd.pdfPage 14 and others from this document have the connections to the ECU.
Hope it helps
Regards
Inquirer