Getting 80 psi with dials set at 40 psi

I have been searching the internet, but cannot find a manual for my second hand Craftsman Air Compressor, Model 106.174540, with 1 HP motor, so I hope you can answer my question.
The label on the tank says it is rated for 100 psi, but all the dial indicators (two) are set for 40 psi.
1) Can I use the compressor to fill my truck tires to 80 psi, even though the dials are set to 40 psi?
2) Can I reset the dial indicators to 80 psi?
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RL from AZ

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