Installation Manuals & How-To Guides

Welcome to DIYAutoTune’s comprehensive installation hub! Whether you’re a seasoned professional or just starting out, our step-by-step guides are designed to help you confidently install and set up your performance tuning products. From ECUs to sensors and everything in between, you’ll find detailed instructions, tips, and troubleshooting advice to ensure a smooth installation process. Get the most out of your build with our expert guidance and hands-on support every step of the way.

Product Pinouts & Manuals

MS3Pro PNP (MSPNPPro)

MS3Pro Wire-in (Mini, EVO, Ultimate)

MS2 Gen 2 PNP (MSPNP2)

MegaSquirt 3, MegaSquirt 2 & Microsquirt

Guides

MegaSquirt Wire-in Installation Articles

These are articles written and hosted here, still not always from first hand experience but often from information gathered with the help of others with first hand experience.  Credit is of course given in the articles to those who helped me bring it all together.  These are ‘living’ documents that will be updated over time.

BMW

Chevrolet / GM

Chrysler / Dodge

DSM

Ford

Honda

Mazda

Mercedes-Benz

Mitsubishi

Mopar (old school)

Nissan / Datsun

Subaru

Toyota

Volkswagen

Volvo

Tech Article Series: The EFI Tuners Guide

Check out our new article series on installation documentation. Whether you’re new to Electronic Fuel Injection and Ignition or have some experience, you’ll find practical guidance in this series. We cover the key steps of planning, setting up, configuring, and tuning your system. Review our detailed instructions to assist with your installation.

The EFI Tuners Guide – Learn How Electronic Fuel Injection and Ignition Systems Work!

Obsolete Products/Hardware & Manuals

This section refers to products that are no longer in production and no longer receive technical support. While these products are not supported, we are providing historical documentation for your assistance. This information is offered to help you understand and maintain these older systems, but please note that no further updates or support will be available for these items.

For more details and access to the historical documentation, please visit our dedicated Obsolete Products/Hardware and Manuals

DIYAutoTune is an MegaSquirt ECU and Digital Dash manufacturing and distribution company. Our main offerings include: MegaSquirt Plug-N-Play Engine Management System, MS3-Pro Wire-in Engine Management System, MegaSquirt-II Assembled and MegaSquirt-II Unassembled versions and MegaSquirt-III Assembled and MegaSquirt-III Unassembled versions, and other wiring components, as well as carrying fuel injectors, wideband O2 sensor systems, and more. Check out our online catalog for the full lineup.

EPA, CARB & Emissions Disclaimer- All ECU's are for race purposes only. It's your responsibility to remain in compliance with all federal, state, provincial, or other laws that apply to you.