FR-S USB port charging pin w/ TRD gauges
 

I have the TRD Sport Meter Set, and doing so replaces the OEM headunit. Because the headunit is no longer present, I assume that the wiring for the charging port is open and not closed, hence why it will not charge anything (I would assume it goes straight to the port, then headunit for aux, then to ground). Is there any info on how to make it effectively charge something? Preferably I would depin the wires behind the headunit to make it work so I do not have to work behind the dash too much.

I wouldn't bother with recycling the aux/USB port for charging. It's not rated for modern fast charging (I think 5V 1.5A at best, but it's 500mA more likely) and will be abysmal for powering anything