GM EFI Wiring Harnesses & Dyno Tuning
Injection Connection Australia specialises in custom and standalone wiring harnesses for early V6 & V8 Holden EFI systems, along with LS1 and E38-based GM engine and transmission conversions.
We also provide EFI dyno tuning, backed by decades of hands-on EFI and electronic transmission tuning experience
Products and services
Shop
Browse our full range of precision-built swap wiring harnesses, adapters, sensors and software. Whether you’re chasing a direct plug-in solution or building a custom setup, Injection Connection has you covered.
Tuning and Performance
Our tuning services are built around years of experience with GM’s legendary LS platforms and the classic Holden 5L and V6 engines. From street setups to naturally aspirated, supercharged and turbocharged performance builds, we provide tailored ECU tuning and dyno services focused on real-world power, drivability, and reliability.
Kalmaker Archive
Dive into our archive of Kalmaker guides, software notes, and reference material. This content is preserved from our original site to support enthusiasts and tuners who still rely on these resources.
NOTE: This area is an old site that is not monitored.
Wiring Harnesses Development
Built by enthusiasts, tested in real world
Crafted by passionate enthusiasts and tested in actual conversions, not just theory, but proven results.
OEM-level finish
Designed with precision to match OEM connectors and specifications, ensuring a clean install and long-term reliability.
Timely Delivery
We value your time and guarantee prompt delivery of our products/services, enabling you to stay on track and meet your deadlines.
