You can mount your FPV monitor to your transmitter using this monitor mount
7-8 inch FPV Monitor Mount to Futaba/JR/WFLY Transmitters
Suit for 7-8 inch monitors.
Compatible transmitter type: Transmitters with metal bar type handle. (like Futaba 9C, 10C, JR 9-ch, WFLY etc.)
* This monitor mount only suits for transmitters with thin metal bar type handle as shown on below picture.