To feed MAVLink data to TeleFlyTiny:
Feed MAVLink data to PIN#12 (U2 RX).
Enter Menu and choose correct "U1 Baudrate" to match your MAVLink data stream.
If your MAVLink data is correctly read by TeleFlyTiny, you will see it's OSD displays correct
Speed/Altitude/Current/Voltage/Artificial_Horizon_Indicator...
Note: You have to supply power to your Camera and VideoTX beside TeleFlyTiny.