MegaSquirt-III with PCB V3.0 – Unassembled Kit
MegaSquirt-III with PCB V3.0 – Unassembled KitMegaSquirt-III with PCB V3.0 – Unassembled Kit

MegaSquirt-III with PCB V3.0 – Unassembled Kit

5 out of 5 based on 2 customer ratings
(2 customer reviews)


In stock

Product Description

Included is a MegaSquirt-III Engine Management System w/PCB3.0 – Unassembled Kit Part # MS330-K

This complete ECU kit includes the MegaSquirt-III drop in daughter card that greatly expands the original MegaSquirt (I or II’s) functionality.

This MS330-K_BL kit includes everything you will need to build your MegaSquirt-3. The genuine B&G partial kit with PCB3.0, the Bill Of Materials, the case, pre-machined endplates and heatsink bar, even the tube of heatsink compound and a bit of jumper wire is included. All you add is tools, solder, and time! The MS3X Xpander board is sold separately and allows you to fully take advantage of the MegaSquirt-3, including 8cyl sequential injection, 8 ignition outputs allowing 8cyl coil on plug, nitrous control, and more.  Add a tuning cable to your order if you don’t have one already. 

MS330-K Kit Bill Of Materials (BOM) Includes:

  • MS3 Daughter Card
  • All ‘Basic Components’, including 2.5 bar MAP sensor
  • PWM Flyback Damping Circuit components
  • Hall Sensor/Coil(-) and VR Sensor Ignition Trigger Components
  • Single Bosch BIP373 High Current Ignition Driver Components
  • Current Limiting Circuit Components

The MS3 daughter card on its own will give you all these features and more:

  • VE and ignition tables are now both 16 x 16
  • 0.1% steps on VE table, 0.1 degree steps on ignition table
  • Socket for an onboard SD card – no laptop required for data logging  (SD Card not included)
  • Built in USB port
  • GM stepper IAC control
  • Closed loop idle and mixture control
  • CANBus communications for interface with GPIO Board, IO Extender, or other devices
  • Staged injection
  • Native support for many different OEM trigger patterns

The MS3 also gives you a starting point for even more expansion. You will be able to connect the headers on this board to additional hardware, such as the MS3X board to enable features like these:

  • 8 channels sequential fuel control
  • 8 channel sequential ignition control
  • Individual fuel and spark trim for cylinder by cylinder tuning
  • 2 and 3 channel PWM IAC control
  • 2 stage nitrous controller
  • Table switching for multi-fuel engines
  • 2 step launch control
  • And more!

For complete MS3 documentation, see


2 reviews for MegaSquirt-III with PCB V3.0 – Unassembled Kit

  1. 5 out of 5


    My truck has been up and running on a MS3X system 6 months now. I bought the unassembled kit and put it together with no issues other than my eyes not being as good as they used to be – I had to buy a lighted magnifier to do the soldering. The kit is very well marked and documented and well worth the effort.

  2. 5 out of 5


    even thow I’ve been a real pain in communications, Matt and DIY Autotune were great in answering and helping in getting the package delivered in time for further shipping to NL,
    now to get it in my hands and put it together, can’t wait to start using my crabs as a doorstop…..

Add a review

What inputs and outputs are provided with this kit?

  • It includes the circuitry needed to connect to the following sensors and outputs:
    • Coolant temperature
    • Intake air temperature
    • 2.5 bar MAP sensor (onboard)
    • Oxygen sensor - narrow band or wideband with external controller
    • Throttle position sensor
    • On/off fast idle valve
    • Stepper fast idle valve
    • 2 injector output channels
    • Tach input - Hall effect, optical, or VR sensors supported
    • Single direct coil control spark output
    • Onboard data logging
  • Adding an MS3X expansion card will add sequential injection, eight logic level spark outputs, and more.

I've seen a mention of an MS3 Daughter Card. Do I need to order that separately?

  • No. The MS3 daughter card is included as part of this kit.

Does this kit include a MAP sensor?

  • Yes, there is a 2.5 bar MAP sensor included. It is a small UFO-like item in a static resistant bag and will not look like a conventional GM MAP sensor.

What firmware does it have?

  • The daughter card ships without firmware. You will load firmware during assembly.