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Supra MK3 MA70 Engine Harness

Starting at $1,550

Custom-built engine wiring harness designed for MK3 Supra platforms. Built for 2JZ swaps, 1JZ swaps, and 7M-GTE standalone setups. Includes full chassis integration — gauges, AC, power steering.

  • Plug and play for MK3 Supra chassis
  • Full chassis integration — gauges, AC, power steering
  • Supports 2JZ, 1JZ, 7M-GTE engines
  • Compatible with all major standalone ECUs
  • OEM-style fit and routing
  • High-temperature motorsport-grade wiring
  • Turn-key engine start guarantee
  • Milspec connector option available
  • Future expandability in mind
  • 1-year warranty on workmanship

Why Choose SVK

Unlike modified factory looms, every SVK harness is built new from the ground up using modern materials, tested for continuity, and designed for long-term reliability. This makes it the ideal solution for high-quality street, track, and performance MK3 Supra builds — whether you're running the original 7M-GTE or swapping in a 2JZ or 1JZ.

1-Year Warranty: Every SVK Works harness is backed by a 1-year warranty covering defects in materials and workmanship. See our FAQ for full warranty details.

In Stock / Made to Order 5-7 Week Lead Time
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$1,550

Base price: $1,550. Final price may vary based on custom requirements.

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Or email directly: info@svkworks.com

FAQ

Common Questions

Yes. SVK harnesses are fully plug and play — designed to connect directly to the MK3 Supra MA70/JZA70 chassis with no cutting or modification of factory wiring. All chassis-side connectors are OEM-spec.
We build for all major aftermarket standalone ECUs including Haltech Elite, Link G4X, MaxxECU, ECUMaster EMU Black/Pro, FuelTech FT550, and more. If your ECU isn't listed, just specify it in the notes and we'll accommodate it.
Absolutely. This harness is specifically designed to support 2JZ-GTE and 2JZ-GE swaps into the MK3 Supra MA70/JZA70 platform. It provides full chassis integration including gauges, AC, power steering, and fan control — making your 2JZ swap as clean and reliable as possible.
Yes. We offer a standalone harness for the 7M-GTE engine, allowing you to run a modern aftermarket ECU on your original engine with full chassis integration and OEM gauge functionality.
Yes. Gauge functionality including tachometer, coolant temperature, speedometer, and warning lights are retained. A/C, power steering, and fan control are all supported.
All SVK harnesses are built from scratch using new high-temperature TXL cross-linked polyethylene wire, OEM-style Toyota/Sumitomo connectors, and motorsport-grade materials. No reused or modified factory wiring.
Standard lead time is 5-7 weeks from order confirmation. Complex builds (milspec connector, unusual swap combinations) may take slightly longer. Rush orders may be available — contact us to discuss.

Free resource

MK3 Supra MA70/JZA70 Wiring Diagrams

Download factory OEM EWDs for 1987 and 1990 Toyota Supra MK3.

View Diagrams →