OBD2A / OBD2B to OBD1 ECU Adapter Harness – Mil-Spec | VTI

Not all adapters are created equal. VTI's OBD2A and OBD2B to OBD1 ECU adapter harnesses are designed, tested, and manufactured in-house — built to the same mil-spec standards as our full engine harnesses. These are not cookie-cutter eBay adapters.

If you're running an OBD1 ECU conversion, Hondata S300, chipped P28/P72, or any professional motorsport build that demands reliable ECU connectivity — this is the adapter you want.

Why VTI Adapters Are Different

• True OEM OBD1 ECU connectors — durable, tested fitment every time
• M22759/32 Mil-Spec Tefzel wire — lightweight, abrasion & heat resistant
• Clean, loom-free routing — professional autosport splice points, no bulky shrink wrap
• Plug-and-play install — drops directly into your stock OBD2A or OBD2B harness
• Made in the USA — designed, tested, and built at VTEC Innovations

Technical Specs

• Wire: M22759/32 20AWG Mil-Spec Tefzel
• Build Style: Autosport splice — no loom
• Connector Type: Genuine OEM OBD1 ECU
• Options: OBD2A → OBD1 / OBD2B → OBD1
• Warranty: Backed by VTI's professional autosport quality guarantee

Perfect For

• OBD1 ECU conversions on OBD2A/OBD2B chassis
• Hondata S300 / chipped P28 / P72 setups
• Professional motorsport and track builds
• Anyone who refuses to trust a cheap eBay adapter on their build

What's Included

• 1x VTI OBD2A or OBD2B to OBD1 ECU Adapter Harness
• Install guide PDF (download)