Want to make your Holley install even more seamless? Want to use all your factory sensors?

Send us your Holley 558-128 main harness and we will replace the following connectors with Ford specific connectors.

• Coolant Temperature Sensors
• Intake Air Temperature Sensor
• Throttle Position Sensor
• Idle Air Control

This eliminates the need to splice in your Throttle Position Sensor and lets you keep your factory sensors.

Notice: Holley stock image used.