OBD2 indicators, fuel level and gear


In OBD2 connection, Gear is calculated per speed and your vehicle gear ratios:

  1. Go to RealDash ‘Settings->Units & Values’ and set Vehicle speed source as ‘ECU Speed Sensor’
  2. Go to Garage, open vehicle door and tap gear shifter
  3. Enter your vehicle gear ratios. Use 0 on unused gears.
  4. Tap vehicle tire and set your vehicle tire size (driving wheel).


While fuel level is part of OBD2 standard, many vehicles do not send this information to OBD2 port via SAE-Standard PID.

By default, fuel level is set to ‘Calculated’. You can adjust the fuel level from Quick Settings (‘Gear’ icon on bottom right). While fuel level is part of OBD2 standard, many vehicles do not send this information to OBD2 port. You can still try to map OBD2 fuel level on RealDash:

  1. Open ‘Settings->Units & Values->Input Mapping’
  2. Find ‘Fuel Level’, select it and select ‘Edit’ on burger menu on the right.
  3. In ‘Select Source Input’ screen, find ‘ECU Specific->OBD2: Fuel Level’ and tap ‘Select Input’

    You can use OBD2 monitor to check if your vehicle is sending the info to standard PID.
  4. Go to OBD2 connection settings and tap ‘OBD2 monitor’
  5. Type commands

The reply to 012F command is the fuel level vehicle reports.


Turn signals and other indicators are not part of OBD2 standard, but there are basically 3 ways to get turn signal and other indicators work on OBD2 vehicles.

  1. Use vehicle specific PIDs. If PIDs are known, you can add those into RealDash OBD2 values by modifying and importing the XML file. See ‘Customizing OBD2 Communications’ from our manuals: realdash.net/manuals/customizing_obd2_communications

  2. Use extra IO box, like SPLeinonen DashBox (www.spleinonen.com). These solutions have extra inputs that can be wired to indicators.

  3. Use DIY solution like Arduino with our open RealDash CAN protocol to transmit indicator statuses to RealDash. See ‘RealDash CAN’ from out manuals: realdash.net/manuals/realdash_can

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