How do you install new stereo in my1991 Saab 900?

The wiring diagram for "Radio - 1991" is on page 371-123 of the Saab 900 16-Valve Official Service Manual, published by Robert Bentley Publishers. Because of copyright restrictions, the diagram can not be posted here.

Every Saab 900 owner should have this book. Price is only about $50. I use mine nearly every week for something.