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Hub Installation

Powering the Hub

  • Installing the OneGauge hub is relatively straightforward. Really, all that must be done is connect the unit to 12-15v power and ground and mount the hub as you like.
  • NEVER power the hub without the main ground connection. When installed, connections to analog sensors or you fuel level sensor can act as grounds if the main ground connection is not properly installed. If this occurs, the main computer will be damaged and require replacement. Please ensure that the unit is properly grounded before powering and periodically check the ground connection to make sure it is good.
  • Wires should never send voltage to the OneGauge hub unless the hub is powered on. I voltage is supplied to any terminal on the hub, the OneGauge needs to be powered on, otherwise damage to the hub is likely to occur.
  • It is recommended to install both a fuse and switch in the positive wire that provides power to any OneGauge component. A fuse will protect against fire in case of a short or other electrical issue and will also protect OneGauge components from being damaged. Typically, a 5 amp fuse is more than adequate. If oxygen sensors are added to the same circuit, or you are running multiple screens as part of an Enhanced LCD display setup, a 10-amp fuse may be more suitable.
  • Before installing power wiring, ensure that the vehicle is off, battery disconnected, and that all other sensors are property installed and wired. Loose or improper connections can damage or destroy the OneGauge and may permanently damage the OneGauge hub, sensors, or screens.
  • Two wires ensure that power is supplied to the OneGauge hub. The red wire should be attached to the positive side of the battery or a relay or switch connected to the positive post. The black wire is ground and is ideally attached to the negative post of the battery but could also be grounded to the frame or engine block. We recommend wiring these up after all sensors have been connected.
  • It is recommended to always run power from the battery and not from another source, such as directly from the alternator. The battery acts as a filter from the system and removes many of the potentially destructive electrical variations that can occur when a vehicle is running. Check all your connections throughout your vehicle, as loose connections have caused power issues in vehicles in the past.
  • Your main vehicle’s voltage is measured from this connection, so no additional wiring is required.
  • Note that if you have indicator wires or any other sensor that is powered by the vehicle also installed on the OneGauge hub, then power from these wires can inadvertently power the OneGauge system as well. This should be avoided since damage to your screen and the Hub are likely to occur in this situation. If this is the case for your installation, it is recommended to ensure that the Hub is powered on anytime the vehicle is on as well.
  • If you are removing your stock instrument cluster, ensure that there are no vital wires that require power or ground that are eliminated when the OneGauge is installed. A good example is an alternator exciter wire; many vehicles require a 12v signal to the alternator that often comes through the ignition or instrument cluster. Removing your cluster may prevent your alternator from charging in this case, so provisions need to be made to provide 12v to the exciter wire.It is the customer’s or installer’s responsibility to understand and prepare for any effects of modifications to their vehicle prior to installation.

Please Note: During starting, the starter often draws considerable power from the battery and may not leave enough voltage for correct OneGauge operation. It is recommended that the OneGauge hub be powered on by switch AFTER the vehicle is running and not during starting.

  • Many vehicles offer “hot while starting” wires to power critical functions, like a fuel pump, during starting. Look for one of these wires first and see if you can find enough power to keep the OneGauge setup powered during engine cranking.

Mounting the Hub

  • We recommend fully testing your entire setup before permanently mounting the Hub. If your mounting location prevents easy access to the USB port of the OneGauge hub, it can be helpful to run a USB cable for easy access in the future in case an update is required to change sensors or make other modifications.
  • Mounting direction (which way the unit faces) also doesn’t matter unless you have an accelerometer installed. The hub can be mounted upside down, on its side, etc., but since the accelerometer has fixed axes the programming of the unit would need to be adjusted if the hub is mounted in a way other than that specified by OneGauge (See Appendix D). The accelerometer can be calibrated using the setup menu of a Standard LCD touchscreen purchased from OneGauge or can be calibrated when purchased if you specify the mounting method.
  • If your hub will be mounted in an area that it will be exposed to water, we recommend water-proofing the enclosure that you use. You can use waterproof enclosures and run waterproof connectors from the terminals to the outside of the box that connect to your sensors. Seal the hole you use for the wiring and you should have a waterproof enclosure! For recommendations on waterproofing your enclosure, see Appendix H.
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