Tire pressure indicator providing a visual indication of tire pressure

A pressure indicator configured for mounting to a valve stem having a male threaded portion, said pressure indicator comprising:

• a housing having first and second ends, said second end of said housing having a transparent portion, said housing defining a cavity;
• a base having a first end and a second end, said first end having a female threaded portion for mating with said male threaded portion of said valve stem, said base including at least one opening defining a passage between said first end and said second end of said base;
• a flexible diaphragm having first and second sides, said diaphragm mounted within said cavity and forming a seal at the first end of said housing, said diaphragm being deformable in response to pressure communicated to said first side of said diaphragm through said at least one opening;
• first and second magnetic members, said first magnetic member being rotatably mounted in said cavity in said first end of said housing and said second magnetic member being rotatably mounted adjacent said first magnetic member and in said cavity in said second end of said housing, said first and second magnetic members each having north and south poles and corresponding first and second portions of the respective magnetic members, wherein one of said first and second portions of said second magnetic member has a first visual characteristic and the other one of said first and second portions of said second magnetic member has a second different visual characteristic;
• said first magnetic member being mechanically coupled to said diaphragm and rotatable in response to deformation of said diaphragm caused by variations in pressure such that one of said north and south poles of said first magnetic member is generally adjacent said second magnetic member when said pressure is below a first predetermined value and the other one of said north and south poles of said first magnetic member is generally adjacent said second magnetic member when said pressure is above a second predetermined value;
• said second magnetic member being magnetically cooperative and rotatable with respect to said first magnetic member such that said first visual characteristic is viewable through said transparent portion of said housing when said pressure is below said first predetermined value and said second visual characteristic is viewable through said transparent portion when said pressure is above said second predetermined value.