And yeah, for temperature sensing I'm using a K type thermocouple with a MAX6675 driver chip. It's super simple and supposedly good up to 1000°C.
If you're rolling your own sensor using an RTD, there are a whole bunch of things to consider. A four-wire measurement system is recommended for any case where accurate readings are important (to eliminate lead wire effects). The dynamic range and resolution of your ADC vs the expected min and max resistance values of the sensor are also important. Also, RTDs are only approximately linear.
This article is pretty good: https://www.te.com/usa-en/industries/sensor-solutions/insights/understanding-rtds.html (edited)