Underslung log tank indicator issues

I’ve a t6.1 converted as a camper. It has an underslung lpg tank for the cooker and propex heater. The led presssure indicator was working fine for first couple of years last year slowly went down to half but seemed to of stopped assumed not much usage. Now it’s showing full again although 2 years since I re filled it. Any suggestions or pointers as to what the fault may be before I start digging ? The indicator has the name livello on it
 
The indicators aren’t very reliable but a lot depends on the accuracy of the angle the tank is mounted at. Also see this video for other potential causes
 
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