No, boost gauges doesn't measure atmospheric pressure + boost. You just make more boost down at lower elevations because the air is denser to begin with.
If you had an absolute manifold pressure gauge (atmospheric pressure + boost, effectively), you should be making ~2bar because 1 atmosphere of pressure is closeto 1 bar.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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