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LCD Screen Setup and Menus

Installation of a OneGauge LCD screen is simple on V3 and V4 hubs- simply use the provided cable and connect it to the appropriate screen terminal on the hub (see the Hub Screw Terminal Diagrams page for photos). A single screen setup will always use the ‘Screen 1’ connector with the exception of Fitech setups, which require the use of the ‘Screen 2’ connector instead.

Screens come pre-loaded with a variety of designs and features from OneGauge. To upload new designs to the screen, please see the ‘Screen Update’ instructions below.

Navigating the OneGauge LCD Screens

All OneGauge LCD screens are touch enabled. Touch the bottom left and right hand corners to switch between gauge designs. Each design is numbered, with a small white number appearing in the bottom right corner each time you change screens. This page number is used to set your default or ‘home’ page as needed. Touching the top left corner of any gauge screen takes to to the menu screen, which includes a variety of setup screens as detailed below. Touching the top left corner takes you to the relay screen to toggle on/off optional relays (see the ‘Relays/On Screen Buttons’ page under Outputs) as well as fuel use tracking and race/track timing pages.

On-Screen Customization

As of 2023, a new feature added to some screen designs is on-screen customization. On some screens (designs 45 and up) the user can use the touch functionality to change which gauges are displayed on various parts of the screen. By touching a location you can scroll through the different sensor display options. The label will change automatically and the appropriate gauge reading will be displayed. Please note that the same labels/gauges are shared across all of the customizable screen designs, so changing one design will impact the gauges selected on all customized screens. If you need the text or label adjusted please let us know and we can change it for you!

Menu – Screen Setup

This screen is used to set your homepage or default page (see Navigating above) as well as setting the hour used for the clock on the screen. Using an hour setting of ‘0’ uses GMT time; United States time zones typically use a -5 to -9 setting depending on your time zone and daylight savings time. The tach adjust number is used only for tachometer signals wired to the RPM1 screw terminal and adjusts the ratio of the signal; setting tach adjust to ‘2’ for example divides the reading by two and would be used if your tach reading is 2x too high.

Menu – Fuel Setup

This menu is used to setup your fuel level input. For details on how to connect the OneGauge hub to your vehicle’s fuel level sensor please see ‘Fuel Level’ under Basic Gauges. Once the sender is connected, use this screen to program the full and empty ohms of your sender. This information is often available online by searching the fuel sender resistance for your vehicle. Tank capacity is used to optionally track estimated fuel mileage. Fuel reading will give you the current fuel level reading based on the resistance readings you’ve entered, and current ohms shows the ohms of resistance measured between ground and the fuel sender wire currently measured, which is ideal for troubleshooting. If you don’t know the resistance at full empty, you can use the current ohms reading to see what the sender reads when the tank is at full and empty and enter those values.

Menu – Thresholds

The thresholds screens allows the customer to set custom warning levels. When a reading is above a certain threshold, the digital readout for that gauge will turn red. For example, if the coolant temp threshold is set at 200 the readings turn red over 200. Sensors marked ‘low’ will trigger the threshold warning below the entered value (such as oil pressure- setting the oil pressure threshold to 10 will trigger the red reading below 10 psi).

Menu – Relay Setup

This screen allows you to set up automatic relay triggers. First select the relay number you want to customize, then select a sensor that will turn on the relay and the value of the sensor reading to trigger the relay on/off. For example, setting the relay to 50 and basing it off of Fuel Pressure will trigger the relay to come on when fuel pressure rises above 50 psi. We understand that this simple menu will not cover the complexities of some setups (for example, if a relay needs to be triggered on above 190 degrees and off under 180) so we are happy to custom program this logic when requested.

Menu – Accelerometer setup

The “ACCELEROMETER SETUP” allows the use to customize the accelerometer settings for vehicle roll/till or g-force readings.
The calibration setting sets the current roll/tilt of the vehicle as “0” and levels out the system. Do this when the Hub is mounted and you are parked on level ground.
The Tilt and Roll buttons allow the user to change the axes of the accelerometer to accommodate various mounting methods.
▪ By default, the Y axis is set as vehicle tilt (front/back) and the X axis is used for roll (left/right).
This assumes that the USB port faces either the front or back of the vehicle. If the hub is
mounted sideways and the USB port faces either the driver or passenger side, use the opposite
▪ Negative “-” axes are used to flip the readings. So if the gauge is reading backwards, use the
opposite setting for the same axis.
▪ Common configurations:
• When box is flat on the vehicle floor, USB faces rear: X, Y
• When box is flat on vehicle floor, USB faces driver’s door: Y, -X
• When box is flat on vehicle floor, USB faces pass door: -Y, X
• When box is flat on vehicle floor, USB faces front: -X, -Y
• When box is mounted vertically, USB faces sky: -X, -Z
• When box is mounted vertically, USB faces ground: X,- Z
• When box is mounted vertically, USB faces driver: -Y, -Z
• When box is mounted vertically, USB faces passenger: Y, -Z

Menu – Manual Transmission Gear Calculation

The “GEAR CALC” page is used to set up current gear calculation to allow the OneGauge to provide a
current gear reading. This feature requires the following:
▪ Accurate speed reading either from GPS or from a VSS Speedometer input. The Upgraded GPS
option is recommend for best results for this feature.
▪ Accurate RPM reading from the vehicles ECU or tachometer module. See the tachometer
instructions for more details.
• Correct rear end gear ratio. Most models only used a limited assortment of gear ratios
for their rear ends, so this is typically available for most makes and models.
• Correct gear ratios for your transmission. Again, these are typically available on the
internet. Enter a ratio for each gear, and for any unused gears enter 0.
• Correct tire diameter. This is the outer diameter for the entire tire, not the wheel or rim.

This feature works well when the vehicle is in gear, but because tire revolutions will not match correctly to speed when in neutral readings may be erratic when the vehicle is in neutral.

Menu – SD CARD Datalogging

The “SD CARD” menu allows the user to trigger SD Card data logging if that option was purchased. Push
the On/Off button to turn logging on or off.
▪ To adjust the frequency that data is logged, change the logging delay. This number is given in
milliseconds (or thousands of a second). Setting it to 200 would log data about 5x/second. A
setting of 100 would be 10x/second. Please note that data is logged only after all sensors have
been read, so slightly more time may pass than what is set for the logging delay.
▪ Writing to the SD card does take time, so it is recommended to find a good balance between
writing frequency (a very low logging delay) and reading sensors. We wouldn’t recommend a
writing frequency lower than 50ms (20x/sec).

To delete everything from your datalog, push the “CLEAR DATALOG” button. There is no undoing this
action, and all logging data on the SD card is deleted when this button is pushed.

Menu – Other Options

“OTHER OPTIONS” includes a few other settings.
▪ The VSS option allows the PPM rate for a speedometer input to be adjusted. Different vehicle
makes and models use different pulse/mile rates.
▪ The various unit settings allow the user to adjust the units used for sensor readings.
• Temp Units set to 0 provides readings in Celsius; 1 provides Fahrenheit.
• Pressure Units set to 0 provides readings in bar; 1 provides PSI.
• Fuel Units set to 0 provides fuel readings in liters, 1 for US gallons, 2 for UK gallons.
• Distance Units set to 0 provides readings in kilometers; 1 provides miles.
▪ The Turn Signal In option changes the input terminals for the turn signals. If your turn signals
respond slowly or are laggy, move your left turn signal wire to terminal C1 on the Hub and right
turn to C2. Then on this screen set the “Turn Signal In” option on this screen to 1. Setting it to 0
uses the standard I4/I5 turn signal inputs. This feature currently in testing

Menu – Demo Mode

The “DEMO MODE” button turns on a demonstration mode that scrolls through the screens and
increments the gauges. This is for use when the car is on display, and the button turns on and off this

Menu – Indicator Setup

The “INDICATOR” setup allows the user to set up what indicator lights show up for each indicator inputs.
These are set up to accept 12-15v signals, which will then illuminate the light as set up in this screen.
▪ A standard V3 version of the OneGauge hub has 3 indicator inputs, indicators 1, 2, and 3. As an
option, an additional 8 indicators (up to 11) can be added standard, though more can be added
for custosm setups.
▪ After navigating to the indicator screen, select the indicator number for the appropriate screw
terminal, then select the indicator light you want to illuminate when 12v is detected at that
▪ For example, if the user wires a check engine light wire to the Indicator 2 screw terminal (see
the terminal map at the beginning of this document for terminal labels), you would select
indicator 2 on this screen and select the ‘Check Engine’ indicator using the ‘Indicator Name’
▪ Note that most of our standard LCD screens only have 3 indicator lights standard, but more can
be added using the Nextion software (see our YouTube channel for details).

Troubleshooting your OneGauge LCD Screen

Because the connection to the OneGauge LCD screen is plug and play we rarely have issues with the screens themselves. A few key points-

-A flashing screen indicators low or not enough power/voltage to your LCD screen. This can damage the screen, please turn off power to the system and check all connections. Make sure that the the hub is being powered by full 12v power (not through the USB port). Check and/or replace the cable that connects the screen to the hub. Note that 10″ screens use shorter cables to ensure less resistance and that the cable is able to provide full voltage. OneGauge uses “XH2.54 4 pin to XH2.0 6 pin” 3d printer stepper motor cables for our screens, which are widely available in 1m, 1.5m, and 2m lengths on Please use 1.5 or 1m cables for 10″ LCD screens.

-If the numbers on your screen do not refresh or update (they’ll typically stay on all 9’s or all 0’s) and the page number in the bottom right corner does not disappear there is a communication issue between the hub and the screen. Please see info above to check/replace the communication cable.

-If the touch screen functionality of your screen is not working, first make sure that the screen is not overly tightened in its case or that there is little to no pressure on the front of the screen however the screen is mounted. The screen will sense ‘touch’ if it is pressed tightly against a mounting surface on the front- small spacers work well in preventing this. Otherwise, check the small cables running to the rear circuit board of the screen from the LCD to ensure there is no damage.

Uploading New Designs to your LCD Screen

See this video series for a quick introduction on using the design software if you are working to design your own screen layouts or make changes –

Once the design is exported as a TFT file please follow these instructions closely:

Start by putting the selected .TFT file on a Micro SD card with nothing else on it. Micro SD cards of 32gb or less are required as larger cards don’t seem to work with the screen. Here is the card that I use:

Put the SD card in the back slot of the screen, it’ll only go in one way, and the power the screen and hub on. The update process will run (the screen will turn white with red text that shows the update progress). Typically any update failures result from having multiple files on the SD card or from using a poor quality SD card or SD card that’s too large.

When it’s done, it’ll say “update successed”… Power the system off, remove the SD card, then power the system on and you should be good to go!

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