Fuel Gauge Driver V2


Download design files:


Files are provided under the open source MIT License.
A copy is included in the ZIP archive.


The ZEVA Fuel Gauge Driver V2 provides a simple and intuitive way to monitor the state of charge of your battery pack by displaying it on your vehicle’s original fuel gauge, plus instantaneous current on the vehicle’s tachometer.

Version 2 offers several improvements over the original Fuel Gauge Driver and FGD Plus, such as a much improved setup interface, simpler screw terminal connections, and a plastic enclosure for some weather protection.

The device is slipped over either your +ve or -ve battery cable, connected to a permanent 12V supply, and its output goes to the fuel gauge in your OEM instrument cluster, replacing the wire that went to the fuel tank level sensor. Optionally, a fourth wire goes to the input of your vehicle's tachometer, and a fifth may be wired to a remote reset button.

Calibration is achieved via two buttons and a bicolour LED:
1) Adjust battery capacity in 10Ah steps (up to 500Ah)
2) Calibrate the position of the needle for 100% SoC at the Full position
3) Calibrate the needle for 0% SoC (Empty)
4) Adjust the tach output to suit your tachometer

Please refer to the user manual (right) for more information about the calibration process. The Fuel Gauge Driver is available with three current sensor options, for 300A, 600A or 1200A max. Lower current sensors offer higher resolution/accuracy at low currents so we recommend going for the smallest sensor which will cover your needs.

The FGD uses a PWM signal to simulate a variable resistance tank sensor and a variable frequency 12V square wave for the tachometer signal. This is compatible with the vast majority of vehicles, but some may be different. If the FGD turns out to be incompatible with your vehicle, you are welcome to return it for a full refund.


Supply voltage: 6-18V
Current measurement range: Up to ±1200A
Battery capacity range: 1-500Ah
Dimensions: 92x40x22mm plus bracket
Weight: 75g

Datasheets & Manuals:



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