Hardware

Which cable do I need?

Tuneless connects to your ECU over a CAN-to-USB cable — it doesn't come in the box with the ECU, and Holley uses two different connectors across its EFI lineup. Match your connector below and get the right one before you start.

Two Holley EFI cable connectors side by side: a round knurled connector labeled Holley Sniper 2, and a flat multi-pin connector with red and black wires labeled Holley Sniper 1 / Holley Terminator / Holley Dominator.

Look at the cable end of your handheld touchscreen display and match it to one of the two connectors photographed above.

Round connector

Holley Sniper 2 — a round, knurled, metal-collar connector.

Get part 558-495 →

Flat multi-pin connector

Every other Holley EFI — Sniper 1, Terminator X, and Dominator all share this flat connector with red and black leads.

Get part 558-443 →

Not sure which ECU you have, or the connector doesn't match either photo? Email hello@tuneless.tech with a photo of your harness and we'll confirm which cable to order.

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