The Hachi Dauntless GRZ Mod Box adds deeper customization and convenience features to the 2022–2026 Subaru BRZ and Toyota GR86 by integrating directly with the vehicle behind the instrument cluster. Designed specifically for the second-generation 86/BRZ platform, the GRZ Mod Box gives owners more control over tachometer behavior, TPMS warnings, shift indicator settings, and selected EyeSight-related functions.

Installation is plug-and-play, with the module connecting behind the instrument cluster. The GRZ Mod Box can operate on its own for supported features, while pairing it with DauntlessOBD Enhanced unlocks the full feature set and makes setup and customization easier.

BRZ/GR86 GRZ Mod Box Overview

Key Features

• Tach Mode Control: Select between round and digital tachometer displays independently of the vehicle's traction control setting.
• TPMS Warning Minimizer: Keeps TPMS warnings dismissed after pressing the Back button instead of allowing them to reappear moments later.
• Custom Gear Shift Indicator RPM: Adjust the RPM point for the flashing up-arrow shift indicator when used with DauntlessOBD Enhanced.
• Plug-and-Play Installation: Connects behind the instrument cluster without requiring a complicated wiring setup.
• Platform-Specific Design: Developed specifically for the 2022+ Toyota GR86 and Subaru BRZ.
• DauntlessOBD Integration: Pair with DauntlessOBD Enhanced for the full feature set and easier configuration.

Why We Like It

The GRZ Mod Box addresses several small factory annoyances that owners deal with every day. Being able to choose your preferred tach layout independently, keep TPMS warnings dismissed, and customize the shift indicator makes the cluster feel much more configurable without replacing factory hardware or adding extra displays to the interior.

Tachometer Control

From the factory, tachometer display behavior can be tied to the vehicle's traction control mode. The GRZ Mod Box separates those functions, allowing you to choose between the round and digital tachometer layouts independently of the current traction control setting.

TPMS Warning Minimizer

When a TPMS warning is present, the GRZ Mod Box allows the message to remain dismissed after pressing the Back button instead of repeatedly returning after a few seconds. This is particularly useful for track setups, alternate wheel configurations, or situations where TPMS alerts would otherwise continually interrupt the cluster display.

Custom Gear Shift Indicator

When paired with DauntlessOBD Enhanced, the GRZ Mod Box allows you to customize the RPM threshold for the cluster's flashing up-arrow gear shift indicator.

Note: The factory GSI / Gear Shift Indicator option must be enabled in the instrument cluster for this feature to function.

EyeSight-Specific Features

On EyeSight-equipped GR86 and BRZ models, the GRZ Mod Box adds additional control over supported driver-assistance settings.

• Pre-Collision Braking Memory: Restores your selected Pre-Collision Braking preference after restarting the engine.
• Fast PCB Toggle: Enables quicker Pre-Collision Braking on/off control through a button sequence.
• GCC EyeSight Support: Can restore EyeSight functionality on supported GCC-market vehicles with the 120 km/h alarm disabled when paired with DauntlessOBD Enhanced.

Specifications

• Brand: Hachi / Dauntless Devices
• Product: GRZ Mod Box
• Installation Location: Behind instrument cluster
• Installation Type: Plug-and-play
• DauntlessOBD Enhanced: Required for full feature set
• Vehicle Platform: Second-generation Subaru BRZ / Toyota GR86

Installation Notes

• Connects behind the factory instrument cluster.
• Designed as a plug-and-play installation.
• DauntlessOBD Enhanced is strongly recommended for setup and customization.
• DauntlessOBD Enhanced is required for certain features, including custom shift indicator RPM and supported GCC EyeSight functionality.
• The factory GSI option must be enabled for shift indicator RPM customization.
• Verify all cluster and driver-assistance functions after installation.

What’s in the Box

• Hachi Dauntless GRZ Mod Box
• Plug-and-play connection hardware/components per kit contents

Compatibility & Disclaimers

Designed for compatible 2022–2026 Subaru BRZ and Toyota GR86 applications. Some functions are limited to EyeSight-equipped vehicles, and certain features require DauntlessOBD Enhanced. Available functionality may vary depending on model year, transmission, market, vehicle configuration, instrument cluster settings, and installed factory equipment. Always verify feature compatibility before installation and use caution when changing driver-assistance or warning-system settings.