Edelbrock EFI 02 Sensor and Bung

The Edelbrock #3591 is a Replacement Narrow-Band Oxygen Sensor For ProFlo1 (#3500 Series) EFI Systems. It is a Bosch 3-Wire, Heated Sensor. It includes Replacement O2 Sensor and Weld-In Bung.

• Use To Guide Carburetor Adjustment And Jetting