Put in an offer on this. Adjustable setpoint, adjustable deadband (difference between 'off' and 'on' thresholds), plug-and-play. Overkill, yes. But no effing around with syringes, pneumatic cylinders, springs and micro-switches. Not my ad. http://www.ebay.ca/itm/Barksdale-Pressure-Switch-E1H-H-VAC-P...