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The harness is required and sold separately from PF4 LS EFI kit.; The Edelbrock Ignition/IAC Harness Kit #35714 is a supplemental harness that required and sold separately from the Gen IV Pro-Flo 4 LS EFI kits.

Pro-Flo 4 Plus EFI Knock Sensor Harness #36125 For Ford Coyote 5.0; This Knock Sensor Harness is an auxillary support item for Pro Flo 4 Plus Ford Coyote EFI Systems. This Harness will plug into the Pro Flo 4 Plus Ford Coyote Main Engine Harness Connector labeled Knock.

Pro-Flo 4 Plus EFI Knock Sensor Harness #36135 Chevrolet LS 3; This Knock Sensor Harness is an auxillary support item for Pro Flo 4 Plus Chevrolet LS 3 EFI Systems. This Harness will plug into the Pro Flo 4 Plus Chevrolet LS 3 Main Engine Harness Connector labeled Knock.

Pro-Flo 4 Plus EFI Knock Sensor Harness #36145 Chevrolet LS1; This Knock Sensor Harness is an auxillary support item for Pro-Flo 4+ Chevrolet LS1 EFI Systems. This Harness will plug into the Pro-Flo 4+ Chevrolet LS1 Main Engine Harness Connector labeled Knock.

Pro-Flo 4 EFI - ECU & Engine Harness Kit For GEN III 24x LS Engines; Edelbrock Pro-Flo 4 ECU & Harness Kit #35711 is for use with Chevrolet Gen III 24X LS engine installations into non-EFI vehicles. Allows you to retain the LS engine's OEM electronic fuel injection system.

Pro-Flo 4 EFI - ECU & Engine Harness Kit For GEN IV 58x LS Engines; Edelbrock Pro-Flo 4 ECU & Harness Kit #35712 is for use with Chevrolet Gen IV 58X LS engine installations into non-EFI vehicles. Allows you to retain the LS engine's OEM electronic fuel injection system.

The harness is required and sold separately from PF4 LS EFI kit.; The Edelbrock #35713 Ignition/IAC Harness is required when installing a Pro-Flo 4 EFI kit on a Gen III Chevrolet LS 24X engine. This kit sold separately from Pro-Flo 4 LS EFI kit.

Pro-Flo 4+ EFI Ignition & Engine Position Harness 36112 Chevy LS 24x Crank/Cam; This Ignition and Engine Harness is required and sold separately from PF4+ Chevy LS EFI System #36130. Harness has connections for Coil Pack Harnesses, Crank Sensor, Cam Sensor and Engine Ground.

Pro-Flo 4 Plus EFI Wiring Harness and Radiator Fan Relay Module #36115; This Radiator Fan Module Harness is designed to simplify Radiator Cooling Fan Installation and wiring with Pro-Flo 4+ EFI Systems.

Pro-Flo 4+ EFI Ignition & Engine Position Harness 36112 Chevy LS 58x Crank/Cam; This Ignition and Engine Harness is required and sold separately from PF4 Plus Chevy LS EFI System #36130. Harness has connections for Coil Pack Harnesses, Crank Sensor, Cam Sensor and Engine Ground.

Pro-Flo 4+ EFI Throttle Wiring Harness 36132 Chevy LS, Single Drive By Wire; This harness is designed to work with the GM Throttle Body.

Pro-Flo 4+ EFI Throttle Wiring Harness 36142 Chevy LS, Dual Drive By Wire; This harness is designed to work with the GM Throttle Body.