Turns out high values of the resistor is bad too, so I'm just gonna use a normal pull-down resistor at 10k
Its a SoftPot membrane potentiometer... unfortunately the design has it so that when you dont press on it the output is not connected to anything
If you mount pin 1 to the A/D-C, Pin 3 to ground/0V and pin 2 through a 10k resistor to Vdd, you will have the A/D-C tied at all times and the resistance can vary from 0V to Vdd/2.
If, on the other hand, you connect it as intended and add a 10k resistor from pin 2 to ground/0V, you just have to factor in that you have a resistance network as opposed to a single variable resistor and let the software compensate for the resulting nonlinear behaviour.
Btw. If you have a 12 bit A/D-C, you can add a 2k2 resistor between pin 1 and Vdd, to get 0V to ~4.096V.