I have a gas meter that I am reading through rtlamr2mqtt that I am trying to add to the Energy dashboard, but it does not show up in the dropdown. I have checked the FAQ and it seems like my sensor is setup correctly... any ideas?
Strange! Nothing jumps out at me as being an obvious problem with your setup. I'm doing something similar, though instead of rtlamr2mqtt (which I didn't know about) I have a bash script run via cron that parses rtlamr output via jq and pipes that to mqtt (mosquitto), but there's very little to it. I know the energy dashboard setup is picky about the energy recording entities.
Mine looks like:
state_class: total_increasing
unit_of_measurement: ft³
device_class: gas
friendly_name: Gas Meter
The name of the entity is sensor.gas_meter and the state is currently 113812 as an example.
Might be worth reading through GitHub issues for rtlamr2mqtt, including closed ones, if you haven't already. Or maybe a hass restart? Can't think of anything else.