Microsquirt DIY Harness

EFI Source

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The Microsquirt ECU was designed for off-road vehicles and watercraft but I have found it works on 4 cylinder engines very well. 


  • Microsquirt ECU
  • 8' Wire Harness
  • Labeled Wires
  • 35 Pin Connector
  • 35 Wire Terminals
  • Mini Jack Serial Cable
  • Mini Jack Connector

If you are using a VR sensor I can add an internal resistor to drop the sensor voltage to avoid ECU sync loss.

Manuals for Microsquirt (3.4.x)

The manuals are split into three main sections : 1. Setting Up, 2. Hardware and 3. TunerStudio Reference. Manuals are available to download as PDFs or to view online page by page in your web-browser.

1. Setting Up

This manual contains a QuickStart Guide, installation, tuning and feature background information.

  • Megasquirt-2 Setting up manual PDF WWW

2. Hardware

These manuals contain wiring, fuel and ignition setup details specific to the ECU

  • Microsquirt Hardware manual PDF WWW

3. TunerStudio Reference

This manual contains a reference of all the tuning settings, datalog fields and general TunerStudio usage.

  • Megasquirt-2 TunerStudio Reference manual PDF WWW