Set up an array of pressure sensors
In this answer I showed that the optimal series resistor value is  

\$ R_S = \sqrt{R_{MIN} \cdot R_{MAX}} \$

where \$R_{MIN}\$ and \$R_{MAX}\$ are the minimum and maximum resistances of your sensor. The Sparkfun page speaks of between infinity and 300 k&Omega;. If we assume 10 M&Omega; as maximum value then your series resistor should be 1.8 M&Omega; (rounded to nearest E12 value).  

These are pretty high values, too high for an ADC, which, like Mathieu says, likes a impedance of less than 10 k&Omega;. So you'll need to buffer the divider with an unity gain buffer opamp:  

  

Note that a common opamp may have an input bias current as high as 1 &micro;A, and this could distort your reading. A CMOS opamp like the MCP600x has a much lower input bias current, 1 pA typical for the MCP600x, which won't deteriorate your reading.