This new Isometric pressure gauge, unlike the current models on the market, which use a single spring for both low and high pressure, uses two different Bourdon tubes for low and high pressure powered by the same connection.
So, we have obtained a double pressure gauge with two different manometric movements but integrated in the same gauge that move two overlaid pointers connected to the same central rotation axis on the pressure gauge, indicating the two different pressures on two arcs circumference.