Maybe I missed it, but is your tank guage a mechanical one? The trick would be to figure out which guage is correct (if either) it's pretty easy to make some adjustment by just bending the float arm on the sending unit.
Otherwise do some math & figure out what it really indicates & just compensate.
I used to have a mechanical & an electrical guage & I still ran out of gas 'cause I trusted them too much, they were both broken!
Now I make sure I have plenty & I top off the tank to make sure.
Doug
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Doug
87 Cuddy with a 94 Black Max 200!
& a 1983 Cuddy, looking for power.
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