How much pressure does the atmosphere exert on a gauge line under deep vacuum?

In a deep vacuum, the atmospheric pressure is significantly reduced, often approaching zero. However, the pressure exerted by the atmosphere on a gauge line can be considered as the external atmospheric pressure acting on the gauge, typically around 101.3 kPa (or 14.7 psi) at sea level. Therefore, even in a deep vacuum, the gauge line experiences atmospheric pressure on its exterior, while the pressure inside the line remains much lower. The gauge reflects the difference between these pressures, indicating a vacuum level.