Fuel Gauge - Reading Fuel Sending Unit Rheostat

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i've looked @ lot of post, still unclear me. i've been following along project,

http://www.design-concepts.com/insights/building-an-arduino-fuel-gauge-and-warning-lights-for-lemons-racing

but not understand need potentiometer in circuit wiring diagram (shown in link).

the goal read fuel level. understand need create correlation between fuel level , resistance values, know 0 gallons 10 ohms , 12gallons 110 ohms. want basic program running before go , increase accuracy more fuel - resistance values.

please explain why potentiometer necessary , why simple voltage divider not read rheostat.

thanks,

case



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