I’m was able to get the first outlet/voltmeter combo wired in and installed last night. Seems to work well but the voltage reading does drop when an accessory is also plugged into the outlet. I’m not sure if this corresponds to the voltage fluctuation at the battery (like when the fridge or furnace is running), but seems like just my phone plugged in wouldn’t be that dramatic so it’s probably just the load on that dead-end line.
The new outlet was deeper than the wall depth so I made a backing plate from a piece of 1/2” trim and painted it black to match the other outlets. Looks good, but aim hoping to not have to do that 4 more times. I used the command strips to mount the baseplate again and it feels solid!
Does anyone have a source for shallower-bodied USB 3.0 outlets? Preferably with the square/rectangle mounting plate as the holes by the manufacturer are pretty sloppy.