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A digital densitometer for a fluid gauging system includes a frequency detection device configured to be disposed within a fluid tank, wherein a frequency detected by the frequency detection device is indicative of a density of a fluid within the fluid tank, frequency detection circuitry configured

A digital densitometer for a fluid gauging system includes a frequency detection device configured to be disposed within a fluid tank, wherein a frequency detected by the frequency detection device is indicative of a density of a fluid within the fluid tank, frequency detection circuitry configured to obtain the frequency from the frequency detection device and output the frequency in a digital form, and an interface for digital communication with an electronic controller, the digital communication comprising transmission of the digital form of the frequency for the electronic controller.

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1. A digital densitometer for a fluid gauging system, the densitometer comprising: a frequency detection device configured to be disposed within a fluid tank, wherein a frequency detected by the frequency detection device is indicative of a density of a fluid within the fluid tank;frequency detectio

1. A digital densitometer for a fluid gauging system, the densitometer comprising: a frequency detection device configured to be disposed within a fluid tank, wherein a frequency detected by the frequency detection device is indicative of a density of a fluid within the fluid tank;frequency detection circuitry configured to be disposed within the fluid tank and to obtain the frequency from the frequency detection device and to output the frequency in a digital form;a data bus having a temperature sensor integrated with a frequency counter is configured to count pulses of an analog signal with reference to a clock and determine a frequency of the frequency detection device, wherein the frequency detection circuitry is in communication with one or more additional components over the data bus, and the frequency detection circuitry is associated with a unique address on the data bus; andan interface for digital communication with an electronic controller, the digital communication comprising transmission of the digital form of the frequency for the electronic controller, calibration parameters of the frequency detection device, and a temperature from the temperature sensor. 2. The digital densitometer of claim 1, wherein the data bus is an 12C bus. 3. The digital densitometer of claim 1, wherein the temperature sensor comprises an integrated circuit that is separate from the frequency detection circuitry and the analog-to-digital converter. 4. The digital densitometer of claim 1, wherein the temperature sensor is integrated into the analog-to-digital converter. 5. The digital densitometer of claim 1, wherein the frequency detection device comprises a vibrating spool. 6. The digital densitometer of claim 1, wherein the frequency detection device comprises a vibrating disk. 7. The digital densitometer of claim 1, wherein the frequency detection device comprises a tuning fork. 8. The digital densitometer of claim 1, wherein the frequency detection device is configured to detect a resonant frequency of a structure in contact with the fluid in the fluid tank. 9. The digital densitometer of claim 1, wherein the interface comprises a four wire connector. 10. The digital densitometer of claim 1, further comprising a computer-readable memory configured to store a density calibration coefficient respective of the frequency detection device, wherein the digital communication further comprises transmission of the density calibration coefficient for the electronic controller. 11. The digital densitometer of claim 10, wherein the memory is configured to be disposed inside of the fluid tank. 12. A hybrid digital densitometer for a fluid gauging system, the densitometer comprising: a frequency detection device disposed within a fluid tank, wherein a frequency detected by the frequency detection device is indicative of a density of a fluid within the fluid tank;a computer-readable memory configured to store a density calibration coefficient respective of the frequency detection device;an interface for communication with an electronic controller over a data bus having a temperature sensor integrated with a frequency counter is configured to count pulses of an analog signal with reference to a clock and determine a frequency of the frequency detection device, wherein the memory is associated with a unique address on the data bus, the communication comprising the density calibration coefficient and the frequency; anda switch configured to selectively electrically couple the interface via the data bus with the frequency detection device or with the computer-readable memory. 13. The hybrid digital densitometer of claim 12, further comprising a temperature sensor, wherein the solid state switch is configured to selectively electrically couple the interface with the frequency detection device or with the computer readable memory and the temperature sensor. 14. The hybrid digital densitometer of claim 12, wherein the densitometer is configured to be disposed inside of the fluid tank. 15. The hybrid digital densitometer of claim 12, wherein the interface is configured for electrical coupling over the data bus with frequency detection circuitry, disposed outside of the fluid tank, configured to obtain the frequency from the frequency detection device, and an analog-to-digital converter, disposed outside of the fluid tank, configured to convert the frequency into a digital form. 16. A digital densitometer system, comprising: a frequency detection device disposed within a fluid tank, wherein a frequency detected by the frequency detection device is indicative of a density of a fluid within the fluid tank;frequency detection circuitry configured to obtain the frequency from the frequency detection device output the frequency in a digital form;an electronic controller, disposed outside of the fluid tank, configured to receive the frequency and to determine a density of fluid within the fluid tank according to the frequency; anda data bus having a temperature sensor integrated with a frequency counter is configured to count pulses of an analog signal with reference to a clock and determine a frequency of the frequency detection device, wherein the frequency detection circuitry is in communication with one or more additional components over the data bus, and the frequency detection circuitry is associated with a unique address on the data bus. 17. The digital densitometer system of claim 16, wherein the frequency detection circuitry is disposed within the fluid tank. 18. The digital densitometer system of claim 16, further comprising a computer readable memory, disposed within the fuel tank, configured to store a density calibration coefficient respective of the frequency detection device. 19. The digital densitometer of claim 18, wherein the electronic controller is configured to determine a density of fluid within the fluid tank according to the frequency and according to the density calibration coefficient.