With the permission of Bosch i have posted full copies of the factory service and technical manuals for both the D and the L Jetronic fuel injection systems for the 914 four cylinder models. Don't I wish I had these when I was debugging mine? As you know, information on these innovative systems is hard to find.
You can get to the manuals by doing a search on the Rennlist site using the exact term "Robert Bosch Jetronic Service Manual" in posts. You do not have to join, but be sure to search for "posts" with that title or otherwise the search engine just sort of sits there and does nothing.
Followinng the search will take you to my post, which includes schematics of both the D and L systems, along with links to the four Bosch manuals. I'm sure this will help some of you restore, debug, and maintain the fuel injection systems on your 914s