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| style="text-align: left; vertical-align: top;" | A fuel tank level sensor which indicates the approximate fuel level on the driver's indicator panel exists in most cars. If the sensor returns analogue signal proportional to fuel level it can be connected to {{{model|FMB640}}} Analog input. After connection to the tank fuel level sensor a calibration is needed because most fuel tank sensors are not linear. Calibration is performed by measuring voltage values resulting from the volume of fuel in tank.

| style="text-align: left; vertical-align: top;" | A fuel tank level sensor which indicates the approximate fuel level on the driver's indicator panel exists in most cars. If the sensor returns analogue signal proportional to fuel level it can be connected to {{{model|FMB640}}} Analog input. After connection to the tank fuel level sensor a calibration is needed because most fuel tank sensors are not linear. Calibration is performed by measuring voltage values resulting from the volume of fuel in tank.

| style="text-align: left; vertical-align: top;" | [[Image:Sch_fmb640_lls.png|250px|center]]

| style="text-align: left; vertical-align: top;" | [[Image:FMB640_Fuel_Sensor.png|250px|center]]

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! style="text-align: left; vertical-align: top;" | Alarm buttons, door sensors etc.

! style="text-align: left; vertical-align: top;" | Alarm buttons, door sensors etc.