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Question:

What tells the driver how much air pressure is in the air tanks?

A Supply pressure gauge.
explanation

All air-brake vehicles have a pressure gauge connected to the air tank. If the vehicle has a dual air brake system, there will be a gauge for each half of the system (or a single gauge with two needles). Dual systems are discussed on page 65. These gauges tell you how much pressure is in the air tanks.

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