I'm not certain on this, but I think the 81-83 KZ1000/1100 service manual serves as the base manual for the KZ1000-P police models, then you'd need the 92 P11 supplement. McDroid probably knows for sure.
zedrider.co.uk --- various service & owner's manuals plus several wiring diagrams & parts lists
73 Z1, 81-83 KZ1000, ZR1100 Zephyr, et al
www.manualedereparatie.info
many manuals in various languages, but most I've seen are in English.
I don't know if there's anything for the Police bikes or any models with the J-engine.
manualslib.com --- pdf manual library
manualslib.com --- pdf manual library --- has all sorts of pdfs & you can view the manuals there on the site.