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Holley Terminator X LS EFI Kit with various connectors and components on a white background

Technical diagram of a LS 58x Terminator X ECU with labeled components on a white background.

Holley Terminator X LS EFI System – Gen IV 4.8L/5.3L/6.0L Truck & LS2/LS3

Holley Terminator X Bluetooth Module
with cable on a white background

Black holley Terminator X wireless tuning module on a white background

Holley EFI Terminator X Bluetooth Module

Holley EFI Idle Air Control (IAC) Motor for LS Throttle Bodies

A black Holley Terminator X handheld controller with a screen, labeled 'TERMINATOR X', connected to a coiled black cable with a multi-pin connector, shown on a white background.

Black Holley EFI 3.5 touchscreen programmer cable with connectors on a white background

Holley EFI Terminator X 3.5" LCD Touchscreen Handheld Controller

Black Holley Sniper EFI throttle position sensor on a white background

Holley TPS sensor 870001 on a white background

Holley Sniper EFI Throttle Position Sensor for LS Fabricated Intake Manifolds

Holley LS3 MAP sensor adapter harness
with connectors on a white background

Holley EFI LS1 LS2 to LS3 MAP adapter
with wires on a white background

Holley EFI LS Main Harness to LS3 MAP Sensor Adapter Harness

A black Holley Terminator X wideband adapter harness with a corrugated black cable, orange and red wire accents, and a white label, shown on a plain white background.

A black multi-pinHolley Terminator X Max replacement harness with orange internal wire shielding and a black corrugated cable, shown on a plain white background.

Holley EFI Terminator X Wideband Adapter Harness

A coiled black Holley EFI CAN to USB cable with a USB-A connector on one end and a small multi-pin connector with orange and black wires on the other, shown on a white background.

A close-up of a Holley Terminator X laptop tuning cable with a black connector housing and a light green insulator, showing two exposed copper wires, on a white background.

Holley EFI CAN to USB-A Cable – Laptop Tuning Cable

Holley Sniper EFI replacement oxygen sensor on a white background

A close-up of a Holley Terminator X Bosch wideband O2 sensor, shown against a plain white background.

Holley EFI Oxygen Sensor – Sniper EFI & Terminator X Replacement

Holley Terminator X Max service ECU 554-153 on a plain white background

replacement Terminator X Max ECU with dimensions on a white background

Holley EFI Terminator X Max Service ECU – Replacement Controller

Holley Terminator X service ECU 554-152 with yellow wire on a white background, featuring 'Terminator X' branding.

A black side-view dimensioned drawing of a replacement Terminator X ECU
with red measurement lines and labels showing 5.1 inches, 4.

Holley EFI Terminator X Service ECU – Replacement Controller

An Holley Terminator X Max Gen IV LS kit laid out on a plain white background, including multiple black coiled wires, connectors, a rectangular control module, small hardware pieces, and a metal probe wire.

A black Holley 550-918 Terminator X Max electronic control module with multiple connector ports and a blue wire, shown on a plain white background.

Holley EFI Terminator X Max for Gen IV GM LS Engines – 58x/4x, EV6, 4L60E/4L80E Control

Holley Terminator X input output harness with connectors on a white background

Close-up of Holley 558-462 I/O harness with connectors on a white background

Holley EFI Terminator X & X Max Input/Output Harness – 8 Pin

Black braided Holley EFI main power harness 558-308 with red and black wires, multiple electrical connectors, and two small metal ring terminals on a white background.

Close-up of a coiled Holley HP EFI battery power harness with connectors on a white background

Holley EFI Main Power Harness for Avenger, HP & Dominator EFI – 13 ft.

Electrical Components