*** Notice: This service is to only be purchased after you have sent in your harness and have been contacted that your harness is done and ready to be returned. Purchasing prior to sending in your harness will result in a 5% return fee and purchase cancelled. ***

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.

Send your harness into M.F. Kustoms and include your contact information inside the box. Most upgrades are completed within 1-2 business days depending on how many are in queue. 

Notice: Holley stock image used.