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Manifold Pressure

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Dustohio

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For the brain trust. My field elevation is 1120’, ATIS says barometric is 30.00, density altitude is 2600’. What should my mp gauge be reading before I start? I have a different gauge I would like to use because the face is clearer, but the old one reads 30 and the replacement reads 28.5. Thanks for any advice
 

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