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After further testing, the voltage from the sender is not consistent, With both tanks having the same issue its hard to believe its the senders. I checked all the connections and recalibrated.

Here is a pic afterwards,

I have a Princeton older puck style sender (5 step not changeable). I recalibrated both the sender and the EFIS and didn't seem to change anything. The Adval shown doesn?t match a full tank.
The...