Correct adjustment of your Mid-West Instrument differential pressure gauge switch is to ensure accurate readings based on application factors. Customers can request at no additional charge to have Mid-West Instrument pre-set the switch(s) at a pre-determined set point or we will set all gauge switches at mid-scale of dial range. You may also field-adjust our switches for your installation. Below in PDF format is the Electrical IOM for each individual model available with a switch(s). These IOM’s will walk you through the switch adjustment process for your specific switch.