Is there a way to connect a Cateye V3 2.4 to Zwift either by using the app or a computer?
It sounds like you’re referring to a Cateye Bike computer and related sensors, correct?
Zwift is not compatible with bike computers or any other devices that only receive data yet. Zwift reads data, but doesn’t transmit it back. Likewise, these devices do not transmit data for Zwift to receive.
As for speed and cadence sensors, Zwift supports all models on the market that connect via ANT+ or Bluetooth Smart (BLE) using open standards.