Includes raw and calibrated classes.

NB: Though DSG_Gauge inherits from DSG_RawGauge they have no virtual destructor (to save RAM) and free-ing DSG_Gauge as DSG_RawGauge will leak memory! Allocating and freeing memory on Arduino is not too hot subject anyways... https://arduino.land/FAQ/content/4/20/en/can-i-use-new-and-delete-with-arduino.html

Classes: DSG_RawGauge, DSG_Gauge

Storage: 3 bytes RAM per DSG_RawGauge and 12 bytes RAM per DSG_Gauge.