Which manual(s) should I get for DIY on a '90 964 C2?
 

thanks

Adrian Streather's manual is highly recommended for 964 owners.
http://www.adrianstreather.com/

Second that. Have used this book an awful lot since getting it and a 964.

stuart 964 C4, 86 carrera

Is it complete for all repairs including major work involving the trans, clutch, engine, suspension ... or should I also get a Bentley's and/or Wayne's next edition? I also heard that there's a 964 supplement to Bentley's manual.

I'd also get the Bentley's and the 964 Factory manuals...

Who sells the 964 Factory manuals?

Ive a thing called the Porsche Carrera 964 Technical Data from Bentley. If you are planning to do tear down the gbox, repalce the igntion system etc, this is thing to have.

Adrian's book is an encyclopedia of the 964. You can get the both on amazon as a package.

stuart