Bad connection to the tank sending unit; or the sending unit itself .
EDIT: A second thought ; did you just have the tank filled ; from empty ?
Does the gauge on the tank read full ?
If you just had the tank filled from empty ; then the internal float could be hung up and the gauge on the tank will show empty , until the float is jarred loose while driving. Then the reading at the tank and on the monitor will correct themselves .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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