All of the above are somehow calculated from the incoming data, not the ‘actual’ data from OBD2 connection.
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Fuel Consumption: Check the units in ‘Settings->Units & Values’. Also check the engine settings in the Garage that they are correct as they are used for consumption calculation.
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Gear ratios must be set in Garage. Go to the garage, open vehicle door and tap the gear shifter to adjust the gear ratios.
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Turn signal indicators etc do not come in OBD2 connection. See discussion here:
OBD2 indicators, fuel level and gear - Connectivity / OBD2 - RealDash Forum