If you are flying a 172p with a diesel engine and fadec, that is a custom alteration from the standard cessna. I can't help you with those pictures, and I think it will be hard to find information about this system.
What you can try is google it, but i guess you have already done that. Also, check the Pilot Operating Handbook, or Airplane Flight Manual that goes with the plane. There should be a supplement about the engine in there. If the company who did the engine-change is located on the field you are flying, go ask there. There has to be someone who can answer your questions there. And ask your instructor, he or she should be able to answer atleast the questions about the system which are relevant for your flying. If you want to know more than that, you might need to find a specific manual or a mechanic.