Nextpal 2-Pack HEI Distributor Tail Wires ensure reliable ignition performance and easier maintenance for your GM vehicle. This durable wiring harness replacement is designed to provide a robust connection and withstand the harsh environment of the engine compartment. Featuring an integrated locking clip and shark fin design, the harness securely connects to the HEI distributor, preventing connector loosening due to engine vibration and avoiding potential ignition failures; this reliable mechanical and electrical connection is crucial for maintaining stable engine operation and consistent performance. Made from high-temperature resistant plastic, the harness can withstand temperatures exceeding 250 degrees Fahrenheit (approximately 121 degrees Celsius), making it suitable for the harsh environment of the engine compartment where high temperatures could damage electrical components; the thicker wire diameter further enhances durability and helps maintain signal integrity, ensuring long-term reliability and stable ignition function. Color-coded wiring simplifies installation; the red wire connects to the 12V battery, and the green wire connects to the tachometer signal. Clear labeling helps prevent wiring errors during replacement or routine maintenance, ensuring easy and correct installation every time. This product is designed specifically for General Motors (GM) vehicles equipped with HEI (High Energy Ignition) distributor systems. It can directly replace the original wiring harness and is suitable for a variety of GMC and motorhome models. Before purchasing, please ensure that this wiring harness is compatible with your vehicle's specific ignition system to ensure correct installation and functionality.