You can’t edit the dump1090-fa config manually when using the piaware sd-card image.
It will be overwritten as is stated at the beginning of the file.
FA won’t like that anymore, they have another method now of getting the UAT data directly into piaware.
You should use the current dump978-fa:
Dump978 Add-On Installation Procedures? - #17 by abcd567
After getting that up and running you can either run a 2nd piaware instance or just point the other piaware at dump978-fa.
These are the relevant piaware config options:
uat-receiver-host
uat-receiver-port 30978
uat-receiver-type sdr
There really is only one type available at the moment and i’m not sure if using the piaware sd card to point it at dump978-fa on another computer will work at the moment.
You might be better off just using a second piaware instance where dump978-fa is running.