The 140 is a Cadillac compared to the 126. Quieter, softer, lighter steering... A lot of the systems are understood by now so there's plenty of support to keep the systems going, even systems the 126 never had like closing assist. This site and v12uberalles.com should keep you going.

I've had 2 140s and 4 126s and as magnificent as the 126 is I don't think I'll ever go back.

Sixto
87 300D