Try this: 5V to sensor to Analog pin, 10K from analog pin to Gnd.
Sensor at 9K, Vout = 5 * 10000/(9000+10000) = 2.6V
Sensor at 30K, Vout = 5 * 10000/(30000+10000) = 1.25V
Stick in other values for 10000, if you want.
If you go bigger, need to allow more settling time for the ADC to give accurate readings.
If you go smaller, the resulting range gets smaller.