Yes, it is possible to collect data with a photogate and other digital sensor, such as a Motion Encoder Cart Receiver (MEC-BTD), Motion Detector (MD-BTD), or Rotary Motion Sensor (RMV-BTD). In this case you must connect the photogate to the DIG 2 port on your interface.
How do I collect data using a Motion Encoder and a photogate simultaneously?
How can I collect data from a photogate and a motion detector data at the same time in Logger Pro?
Vernier Photogate (VPG-BTD) Troubleshooting and FAQs