Orqa FPV.Connect Wiring
The Ghost integration guide shows the two solder pads that need to be bridged for the serial port to be actually connected to the goggles. You also need to enable the Ghost integration for this mod to work at all. This is also described in the article.
Most(?) ELRS receivers need 5V to function. The Ghost pads on the FPV.Connect only provide 3.3V. There is a small capacitor where we can get 5V directly from the Goggles (see picture). Ground can be used as is, directly from the leftmost pad on the FPV.Connect module, you can use a single header pin to get some clearance between the receiver and the FPV.Connect.
The TX pad from the receiver needs to be connected to the rightmost pad on the FPV.Connect (RX), you may need to use a small length of wire to make the connection, the receiver shown below does not have it's TX pad on the rightmost pin. There is no need to connect the receivers RX pad, the goggles do not need to send data to the receiver for this to work.
You can potentially use the on-board antenna of the FPV.Connect module for any 2.4 GHz receiver using a U.FL to U.FL cable, like the one that Orqa provides for the Ghost integration. It seems to not be connected to anything else on the board.
You have to enable the Ghost integration as described in the manual linked above (do not forget this). You have to use a RapidFire module and have SPI-mode enabled for the Goggles to be able to control the VRx.