I too am a bit leery about buying the CD manual for mine, a paper manual is not available for the 126 chassis from what I understand. So far I have depended on this site for what I haven't been able to figure out myself, but I'm sure that I am like many who want a picture of what they are looking for under the hood. Thinking about it off hand I can recall about 6 or 8 different wiring plugs that are very similar in shape (is THIS the one I'm looking for.....). In the past I have sometimes relied on manuals that were close (same manufacturer) and simply adapted to what I had in front of me. I'm tempted to buy a paper manual for the 4 cylinder (190 I think) and adapt since it appears close to what I have with an inline 6.
1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)