I don't see the point writing a book when instrumentation technology advances at a fairly rapid pace.
Besides such a book needing to be revised frequently there are so many combinations and methods of hooking up instrumentation to flight computers that it would be near impossible to document them all.

Even if you did manage to document it all, if someone is too lazy to read and understand the existing manufacturer manuals then the chances are that they're not going to bother with a long, boring, technical soaring book on flight computers either.

One can find much better, up to date, information using a web search engine, manufacturer manuals and online forums IMO.