I did not find the standard optional devices showing the fuel level and clock. In any case, I am not satisfied that these devices show too little information, but at the same time take up too much space. tially, I installed a universal device with readings of time, ambient temperature and on-board mains voltage. The device is inconvenient because it shows everything individually, the clock, either the voltage or the temperature. The readings are switched by pressing a button on the device itself, which is inconvenient when moving.
He is a radio engineer by profession. After thinking a little about the solution, I bought ready-made nodes. All that remains is to connect them together and write a program. n addition to the power supply, there is also fuel level data from the ECU on the standard fuel indicator connector. An ordinary transistor output with an open collector. It is enough to tighten it with a resistor for power supply in order to take voltage readings depending on the fuel level in the tank. I wrote a program. connected all the nodes, recorded the firmware in the controller. At the moment, this is the result. I rewrote the code several times to display the information clearly.
Communication of the display, clock and controller via the i2c bus. 1 ware temperature sensor.