How do I install it?

The HaulGauge connects to the diagnostic port (OBD, underneath the steering wheel) and communicates wirelessly via Bluetooth with an app on your iPhone or Android device (check our Compatibility page to see which phones are compatible).

Our YouTube channel has a great video on getting started:


The app will guide you through everything else. No need pair to the HaulGauge through the phone’s Bluetooth settings – all pairing is handled through the app, and pairing outside the app can cause abnormal behavior.


Do I need to calibrate?

Most vehicles 2008 and newer will have preset calibrations. The majority of our users simply plug in their HaulGauge and everything is already set up.

For vehicles that are not pre-calibrated, the HaulGauge app guides the driver through a step-by-step calibration procedure; this takes about 5-10 minutes.

Check for a Calibration:

What vehicles will it work with?

Please check out our Compatibility page.

Can I leave it plugged in all the time?

You can leave the HaulGauge plugged in; it will not drain the vehicle’s battery, and many users prefer to do this.

If you’d like to unplug it and only plug in HaulGauge before using the app, that works too. The app will store your vehicle’s settings (for example, if you need to take your vehicle to a mechanic).