The 2 differences between the SeeLeveL RV Holding Tank Monitoring Systems # SE33VR and # SE39VR is the # SE33VR has the bluetooth capability and it can also integrate into the propane tank sensor.
Neither of these systems will integrate with the Firefly system you have so you will need to install the new panel and sensors.
Before you go ahead with the new sensors have you tried using any Valterra Sensor Power Sensor Cleaner # V22011. It could simply be the sensors inside the tanks may... view full answer...
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