AutoMeter LS Plug and Play Harness With Tach Adapter

2010–2025 General Motors LS Engine Swap / LS-Based Engine Applications

Part #: 9123

Overview

If you've undertaken an LS engine swap or are working with LS-derived engines, ensuring your tachometer functions correctly can be a challenge. Many enthusiasts face difficulties integrating aftermarket gauges with factory wiring, often leading to complex wiring procedures or risking damage to existing components. The AutoMeter LS Plug and Play Harness with Tach Adapter offers a straightforward, reliable solution to this common problem.

This harness is designed specifically for LS-based engines, providing a seamless connection between your engine's tach signal and your aftermarket gauge. It eliminates the need for splicing, cutting, or modifying your factory wiring, saving you time and reducing frustration during installation. Whether you're building a street performance vehicle, a track-ready machine, or a custom project, this harness ensures your tachometer reads accurately and consistently.

Key Features

The AutoMeter LS Plug and Play Harness with Tach Adapter is engineered for ease of installation and dependable performance. Its key features include:

• OEM-spec connectors and wiring harnesses that match factory LS engine wiring, ensuring a secure and reliable connection.
• Plug-and-play design that requires no cutting, splicing, or modifications to your vehicle's original wiring harness.
• Includes a tach adapter compatible with AutoMeter gauges, providing a clean and accurate tach signal.
• Built with high-quality, durable materials to withstand engine bay conditions, including heat, vibration, and moisture.
• Designed for quick installation, allowing you to get your vehicle up and running faster without sacrificing reliability.
• Compatible with a wide range of LS engines, including LS1, LS2, LS3, LS6, LQ4, LQ9, and more.

Construction & Design

The harness features a robust construction with OEM-style connectors that ensure a perfect fit and secure connection. The wiring is insulated with high-quality materials resistant to heat and abrasion, making it suitable for the demanding environment of the engine bay. The tach adapter is integrated seamlessly into the harness, providing a stable and accurate tach signal without interference or noise. Its compact design minimizes clutter and simplifies routing within the engine compartment, maintaining a clean and professional appearance.

Performance & Reliability

Designed to provide a reliable tach signal, this harness ensures your aftermarket gauge displays engine RPM accurately, which is crucial for tuning, monitoring, and overall vehicle performance. The plug-and-play nature of the harness reduces installation time and minimizes the risk of wiring errors, giving you confidence in your setup. Its durable construction guarantees long-term performance, even under the harsh conditions of engine operation.

Installation & Fitment

Installing the AutoMeter LS Plug and Play Harness with Tach Adapter is straightforward and requires no special tools or modifications. Simply disconnect your factory wiring harness from the LS engine, connect the OEM-style connectors from the harness, and route the wiring as needed. The process typically takes minutes, making it ideal for both professional installers and DIY enthusiasts. No cutting, splicing, or tuning adjustments are necessary, ensuring a hassle-free upgrade.

• Connects directly to your LS engine's factory wiring harness.
• Includes all necessary connectors and hardware for a complete installation.
• No cutting, drilling, or tuning required.

What's Included

• AutoMeter LS Plug and Play Harness with Tach Adapter
• OEM-style connectors and wiring
• Installation instructions

Ideal For

• LS engine swaps in street, track, or off-road vehicles
• Enthusiasts seeking a quick, reliable tachometer hookup
• Professionals performing custom engine installations
• Anyone looking to avoid complex wiring modifications during LS engine integration

Emissions Note

This product is designed for off-road use only and is not emissions-compliant for street use in all jurisdictions. Please verify local regulations before installation.