Surprised nobody has mentioned Carl Allison's schematics, I've found them pretty good, occassionally they have the odd error, but overall very easy to read. The factory wiring diagrams are pretty difficult to follow, at least for me
Available on This Old Tractor, Gregg Bender's site
https://www.thisoldtractor.com/guzzi007/sportissimo.html
I'm taking a chance here but as @Kiwi_Roy seems to have gone Off Grid, I've dumped what schematics I have of his onto Drop Box in case anybody would like to grab them. I'm pretty sure he won't mind
https://www.dropbox.com/scl/fo/no8adkie1sl6frnc2qmm8/ALzrUXsngCqMRtfMR1cXedE?rlkey=8x5byzd4ux3107610i22ig5v6&st=3xbx7rbu&dl=0