How to Connect AirSpeed Sensor to Pixhawk2

I haven’t been able to find in the documentation exactly how to connect an airspeed sensor. The one diagram has GPS1 with two lines, one running to GPS1 connector, the other to the I2C connector. So, no 4-port expander like we had on the previous Pixhawk? Or did I miss something, which is more likely?

The pixhawk 2 package does provide the I2C expander just like pixhawk1. And it also has a dedicated I2C port to plug in airspeed sensor.

Is there any difference in using i2c #1 vs #2?

based on my understanding there is no difference between the I2C ports as there is only one I2C interface. Correct me if I am wrong.

There is I2C splitter when you buy it.