Hall Pantera still sells repro Mangusta Owners Manuals (13 pgs), reasonably priced but as mentioned it does not have that illustration. Thanks, Denis! I will clean & add it.
Copies of the Owners Manual along with the 135 pg Mangusta factory Parts List are in the POCA Archives. Archive scans are at 300 dpi; a typical computer monitor displays at 72-80 dpi.