Also tried a custom adc sensor, but readings are way too high using this:
#[adc_temperature my_sensor]
#temperature1: 120
#voltage1: 0.321359
#temperature2: 138
#voltage2: 0.360704
#temperature3: 155
#voltage3: 0.399804
#temperature4: 170
#voltage4: 0.438905
#temperature5: 186
#voltage5: 0.478372
#temperature6: 196
#voltage6: 0.518573