Take it to a dealer and get it recoded, piece of cake.

That only mentions "SIMOS PCR", whatever that is...

so here is the story , lol

The 3.0T engine is in a Audi 1995 B4 90 with a O2x 6sp tranny from a 2007 A4 .  The ECU and engine is from and automatic 2010 A6 and I need to replace the ECU with another ECU from a 2010 S4 that has a manual transmission . I am working on switch over the cabin wiring harness from the A6 to the B4 90 in order to have the A6 cluster , MMI ( maybe ) , ABS and other sub system working as well .

Oh this a fun project :0 . I have a complete donor A6 parts car so the parts are not a problem.

So my options are :

1. get the pin numbers from the master ecu and junk yard ecu so i can pair the cluster with the junkyard ecu.

2. turn off the immo on the junk yard ecu ( ecu from S4 with stick shift )

3. some how reprogram the A6 engine ecu from automatic to manual transmission

 what do you think guys  
please and thank you for any help you can give .

The Simos 8.3, 8.4 used a different can bus protocol between the S4 and the A6 with the same engine ??  I didnt know that  and  thank you for the heads up.    That would have been a nightmare and a $hit show lol .   

Yeah I am way over my head when it come to the newer Ecu architecture . :-)