The in car computer in Police Cars have been around for a while and I know a fella whose ankle was broken when the pole holding the screen bent back on his foot is a high speed crash. Why he didnt sue I dont know.
As for the Paddy Wagon, did you get any photos from the back? I see a similar one crusing around with 19.1 on the back. Reason I know the number is that is the old call sign for Bankstown Police and lets just say.....in my youth...that number was very familiar..
Edit.. found a pic...yep....same car, same number plate!