What is Tefzel wire and why is it used in motorsport wiring?

Tefzel is a brand name for ETFE (Ethylene Tetrafluoroethylene) fluoropolymer wire. It is the go-to wire for professional motorsport and aerospace wiring because it is rated to 150C, 600V, and has exceptional resistance to fuels, oils and chemicals. It is also significantly lighter and more flexible than standard automotive wire at the same gauge, making it ideal for weight-sensitive race car applications.

What AWG wire should I use for my engine management wiring?

For most ECU signal wiring including sensors, triggers and outputs, 20 or 22 AWG Tefzel is standard. For injector and coil wiring, 18 AWG is commonly used. For power feeds, fuel pumps and high current circuits, 16 AWG or heavier is recommended.

What is the difference between Deutsch DTM, DT and DTP connectors?

The DTM series is a miniature waterproof connector rated to 7.5A per pin, ideal for ECU signal wiring and sensors. The DT series is larger, rated to 13A per pin, and is the most widely used connector in motorsport wiring harnesses. The DTP series is a high current connector rated to 25A per pin, used for fuel pumps, fans and other high draw applications.

What is Raychem DR-25 and why is it used instead of standard heatshrink?

Raychem DR-25 is a military specification heatshrink tubing rated to 150C with a 2:1 shrink ratio. Unlike standard heatshrink, DR-25 is flame retardant and resistant to fuels, hydraulic fluids, lubricating oils and aviation fuels. It is the industry standard for motorsport and aerospace wiring harness sleeving.

Should I solder or crimp my motorsport wiring connections?

Crimp every time. Soldering is actively discouraged in professional motorsport wiring because solder creates a hard point in the wire that can crack and fail under the constant vibration of a race car. A correctly executed crimp with the proper tool creates a gas-tight cold weld between the wire strands and the terminal.

What is a PDM and do I need one?

A PDM (Power Distribution Module) replaces traditional fuse boxes and relay panels with a single programmable device. It controls all switched outputs in the vehicle, provides overcurrent protection, and integrates with your ECU for data logging and diagnostics. PDMs save weight, reduce wiring complexity and make fault finding much easier.

How long does a full vehicle rewire take?

A full vehicle rewire at 12Volt Motorsports typically takes between 2 and 6 weeks depending on the complexity of the build, the number of systems involved and the level of finish required. Simple engine bay rewires with a new ECU can be completed faster. Contact us early to discuss your project and timeline.

Do you ship parts Australia wide?

Yes. We ship all products Australia wide. Most in-stock orders are dispatched within 1-3 business days. We stock genuine Haltech, Deutsch, Raychem and Tefzel products so what you see on the website is what we use in our own builds.

Does an aftermarket ECU make my car more powerful?

Not by itself. An ECU is not a power adder. What it does is give a professional tuner the ability to precisely calibrate your engine's fuel delivery, ignition timing, boost control and cam timing to extract the full potential from your existing setup. The power gains come from the quality of the tune, not from the ECU alone.

Which ECU brand should I choose for my build?

Haltech is our primary recommendation for most Australian performance builds. Motec suits professional motorsport at the highest level. Emtron is an Australian-made ECU sitting between Haltech and Motec. Holley EFI suits American V8 applications. FuelTech is the preferred choice for serious drag racing. Contact us on 0458 102 134 to discuss which suits your specific build.

What is flex fuel and can my ECU run it?

Flex fuel means the ECU can automatically adjust fuelling and ignition timing on the fly depending on how much ethanol is in the fuel, so you can run anywhere from standard 98 octane petrol to E85 or any blend without re-tuning. All current Haltech, Emtron, Motec, Holley and FuelTech ECUs support flex fuel with the addition of an ethanol content sensor.

Can you install an aftermarket ECU on any car?

Most wire-in ECUs from Haltech, Motec, Emtron, Holley and FuelTech can be fitted to any vehicle with a custom wiring harness. Haltech also makes plug-in ECUs for popular platforms including Nissan Skyline R32/R33/R34, Mazda RX-8 and GM LS engines. We build custom harnesses for all makes and models.

Aftermarket Sensor Connectors

Plugs for the sensors on your build: pressure, temp, flex fuel and OEM style sensors used with Haltech, Link, MaxxECU and standalone ECUs. Supplied with terminals and seals. Guide and FAQ below the products.

Vendor:12Volt Motorsports

Bosch Combined Pressure and Temperature Sensor Connector, 5 Pin

5 pin Bosch connector for Bosch combined fluid pressure and temperature sensors. Suits the popular Bosch motorsport pressure and temperature sensors including part numbers 0 261 230 340, 0 261 230 482 and 0 261 544 01F. These combined sensors measure both pressure signal...

$15.00

$15.00

Unit price

per
Vendor:12Volt Motorsports

Pressure Sensor Connector | 3 Pin Delphi GT150

3 pin Delphi GT150 connector for pressure sensors and transducers. The GT150 3 pin is one of the most widely used sensor connectors in motorsport wiring, appearing on pressure transducers from AEM, Haltech, MoTeC, Link, Turbosmart and many others. Also commonly fitted as a...

$12.00

$12.00

Unit price

per
Vendor:12Volt Motorsports

Bosch EV1 Injector Connector, 2 Pin

Bosch EV1 style 2 pin fuel injector connector. The EV1 is the most widely used injector connector across GM and Holden LS series engines and is also compatible with a large range of aftermarket injectors from Bosch, Siemens Deka, RC Engineering and others. A...

$14.00

$14.00

Unit price

per
Vendor:12Volt Motorsports

IGN-1A Smart Coil Connector | Push to Seat, 5 Pin

Push to seat 5 pin Delphi GT150 connector for the IGN-1A high energy smart coil, also known as the Mercury coil. The push to seat design allows terminals to be inserted from the front of the housing after crimping, making installation significantly easier than...

$23.00

$23.00

Unit price

per
Vendor:12Volt Motorsports

Bosch LSU 4.9 Wideband O2 Sensor Connector

6 pin connector for the Bosch LSU 4.9 wideband lambda sensor. The LSU 4.9 is the industry standard wideband oxygen sensor used with wideband controllers from AEM, Innovate, Haltech, MoTeC, Holley and virtually all aftermarket ECU platforms that offer integrated wideband control. The connector...

$15.00

$15.00

Unit price

per
Vendor:12Volt Motorsports

Bosch DBW Throttle Body Connector

6 pin connector for Bosch Motorsport and compatible aftermarket drive by wire (DBW) throttle bodies. Suits the widely used Bosch electronic throttle body range including the 0 280 750 149, 0 280 750 150, 0 280 750 151 and related part numbers, which have...

$20.00

$20.00

Unit price

per
Vendor:12Volt Motorsports

GM Flex Fuel Sensor Connector, 3 Pin

OEM replacement connector for the GM Continental flex fuel sensor. Suits Continental flex fuel sensor part numbers 13577394, 13577379 and 13577429 as used in GM and Holden flex fuel applications. The flex fuel sensor reads ethanol content and fuel temperature, providing the signal needed...

$18.00

$18.00

Unit price

per
Vendor:12Volt Motorsports

GM Coolant Temperature Sensor Connector, 2 Pin

OEM replacement connector for the GM Engine Coolant Temperature (ECT) sensor. Uses the Delphi Metri-Pack 150.2 2 pin housing as fitted to LS series and many other GM and Holden production engines. Suited to harness repair, engine swap builds and any application where the...

$15.00

$15.00

Unit price

per
Vendor:12Volt Motorsports

GM Intake Air Temperature Sensor Connector, 2 Pin

OEM replacement connector for the GM Intake Air Temperature (IAT) sensor. This is the Delphi GT150 2 pin connector used across LS series engines including LS1, LS2, LS3 and related Holden variants. Suited to engine swap harness builds and replacement of damaged factory connectors....

$15.00

$15.00

Unit price

per