Air filter restriction sensor assembly

An air sensor assembly for use with a small gas engine comprising:

• a hermetically sealed housing defining an interior wall that forms a chamber in the housing, the interior wall defining an opening,
• a plunger member mounted through the opening, the plunger member defining a contact surface and a plunger face, the plunger face positioned in the chamber, and
• a switch mounted in the housing and between the contact surface of the plunger and the interior wall,
• whereby upon the creation of a vacuum in the first chamber, the plunger will move in the chamber and cause the contact surface to contact the switch.

An air filter restriction sensor assembly for coupling to a remote indicator comprising:

• a housing defining an interior and an interior wall, the interior wall dividing the interior into a first chamber and a second chamber, the housing including a nozzle,
• a plunger mounted in the housing and extending between the first chamber and the second chamber, the plunger including a contact surface,
• a membrane switch mounted in the first chamber, the switch being connectable to a remote indicator, and
• a plunger moving member mounted to the plunger and in the second chamber,
• whereby upon the creation of a vacuum in the second chamber, the plunger moving member causes the contact surface to move into contact with the membrane switch.