You answered your own question? I dont get it, you , first you said 0-14 inches......inches of vacuum is NOT = to psi. In your own reply which is correct it says to 14.7 psi which equals about 30 inches of mercury. Or basically sea level air pressure. A 1 bar sensor reads na pressure because thats all it sees, 14.7 psi or one bar or sea level.
BTw they read both sides of zero, not ussually 0 to some number, but rather 30 inchs of vacuum to 0 to 30 inches of pressure , thats a 1 bar sensor. Ie 30 inches of pressure equals about 14.7 psi or NA.
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