Uniden says it wont work with any p2 or hp scanners. But if your handy with wire making, you can always give it a shot and try. I use mine with my 996t, but wish it worked with my 536. Would make life so much nicer.
I built a cable to use the RH-96 with a 996XT thru the rear serial port and it worked fine.
I then tried it on my 996P2 and it did not work. I would love for this to work and would buy 3 more 996P2's if it did to replace the 996XT's in my truck.