GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Likely can't: boats don't have manuals like cars generally speaking. Probably get a shop manual for the outboard, and then ask questions on the forum for the rest of it.
Starcraft, Sylvan, Smokercraft family have changed hands several times in the past 40 years. Doubt you will find a manual.
And doubt it would contain anything useful if you did find one.
No wiring or plumbing diagrams.