On your last two considerations:
4. There is zero atmospheric influence on the indicator short of being in a perfect vacuum. It reads only the pressure delta above ambient created by the moving piston in a closed cylinder.
5. Nitrogen permeability would be a 4X greater concern considering the chemical composition of air.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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