 The autopilot, which was taking its airspeed information from the same equipment that was providing faulty readings to the captain's ASI, increased the pitch-up attitude and reduced power in order to lower the plane's airspeed.The co-pilot's ASI was giving a correct reading of and decreasing, yet the aircraft started to give multiple contradictory visible and audible warnings that it was flying too fast, including rudder ratio, Mach airspeed, and overspeed.The autopilot reached the limits of its programming and disengaged.