Usually, with things like airspeed indicators for example, there are two sensors, one on each side which get activated depending on who is flying, like you said

Usually, with things like airspeed indicators for example, there are two sensors, one on each side which get activated depending on who is flying, like you said. However with airspeed for example they are supposed to monitor the difference in reading and if one sensor goes faulty the system should switch over. Why that doesn't happen with these sensors I have no clue