FlexiForce read problem

I have an Arduino Uno, and I am using a tekscanA201 flexiforce. I am trying to read analog output.
Below is the code I use to read data from flexiforce. But instead of getting values from (0-1024) I get values up to like 100.
How can I fix that problem?

int flexiForcePin = A3; //analog pin 3

void setup(){

void loop(){
  int flexiForceReading = analogRead(flexiForcePin); 

  delay(100); //just here to slow down the output for easier reading

What value are you using for the reference resistor? You should be able to bring it down to 2k Ohms at 5V.

What op-amp are you using in the "Recommended Circuit"?