How does the OSD work with the O3? Could I just hook up the power and ground pins to a 3s Lipo? I would like to put it in an FPV wing (that has no flight controller, just a receiver) but I just need the image transmission and the battery voltage. Would that work? Thank you.

You get the standard "Avata"-OSD directly from the Air Unit, even with just the power supply connected.

IF ON BOARD RECORDING ON THE O3 IS ALL YOU NEED, do this in your goggles 2: ensure adequate and more power is available to the O3 ( i connected only the red and black wires  to power 12vdc and 2.5A. all other wires were left alone - no flight controller or anything, just power)  used for non fpv drone applications- on your wing or rc car or whatever.   So, in your goggles 2, keep the "auto low power" setting on to start with. Next, pick the sd card on the O3 to record on. Setting to record on to "both" (goggles-sd card and O3-sd card)  Next when you want to start recording, in goggles, switch the "auto low power" to off and next swipe down in the goggles and hit record in the top menu.  I got 4k-120fps recorded on the SD card. however, it said O3 processor over heated in about a minute. SO use heat sinks or fans or be from a very cold place. (firmwares: latest as on today) confirm here once you try. all the best