Directly to the Pico can't be connected any sensor. Sensors can be connected to ST107, SCQ25T, SC302T or SC502T. To these devices can be connected liquid sensors (Freshwater, wastewater, fuel) with voltage output (range is 0V to 35V) or resistive output (range is 0 Ohm to 65 kOhm).
Example of liquid sensor with resistive output is on the link KUS USA SSS Fuel & Water Level Sensor:
Example of liquid sensor with voltage output is on the link SensorONE Submersible Diesel Fuel and Water Tank Level Sensor.
How to Connect sensors with current output is described in the article VDO Freshwater Level Sensors, 4-20mA .
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