Megasquirt ECU accessories and upgrades
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Price: £130

Postage: £5 UK - £8 Abroad

Spartan 2 WideBand Lambda Controller and Bosch 4.9 Lambda Sensor

Spartan 2 is the first Wideband Oxygen Controller to use all extended temperature components, this means Spartan 2 offers

the widest operating temperature; -40[C] to 125[C], of any Wideband Oxygen Controller on the market.

From the frozen Arctic Tundra to the baking heat of Death Valley, Spartan 2 is the Wideband

Oxygen Controller you can rely on.

See HERE for more details on this fantastic wideband setup.

For wiring info see HERE.

See HERE. for the instruction manual.

Price: £35

Postage: £3 UK - £5 Abroad

Bluetooth remote wireless comms - compatable with Android, Iphone, Windows, etc

No modifications needed, it plugs into your db9 pin connector on the front of the MS ECU, giving the RS-232 port a bluetooth wireless capability.

Fully configured ready for you to use the various app's on your Android phone or Android tablet to tune the ECU and to show dashboard info, etc.

Suitable for any MS ECU except for the early V2.2 boards or those with a micro USB port. If you have a V2.2 then you will need to add a couple of wires internally to give the bluetooth unit a 5V supply.

The MS1 has a different baud rate to the MS2-3, so if you want to use it on an MS1 please Email me before buying and I will sort that for you.

LS-2 Coil Near Plug (COP) Ignition Coil - No Driver Needed - Built in Ignitor

Coils compatable with an MS3X - D585

This coil has an increadable high power output, it can be directly controlled with an MS3X ECU, or any ECU with a 5V spark output, as it has a built in Ignitor.

The coils come with a 250mm long, 8mm HT lead and connector for the power / control

Logic level 5V signal to fire unit. 5V starts charging the coil, drop to zero volts and the coil fires.

MS1-2-3 main wiring looms

These are included in the ECU package prices, so you do NOT need to order one if you buy an ECU from me.

But if you need a wiring loom for your MegaSquirt ECU, then these are supplied with bare ended wires ready for you to wire to your setups connectors.

The looms are approx 1 meter long with a high quality, screened cable for the trigger signal and multiple 0.5mm ground cables for good noise separation.

Each wire is colour coded and has a label with it's description on it that matches the diagrams I supply, these are also on this site.

As the wiring looms are made to your setup requirements, please contact me with all your details before ordering.

Coolant/Air temperature sensors

If your engine doesn't have both temperature sensors then it is possible to use a sensor from a scrap yard. But some people like to use the original MegaSquirt sensors as the MS ECU and the tuning software is already setup for these.

The open style air sensor is ideal for fast changing temperatures from boosted engines. The closed style is ideal for coolant and air temperature sensing in most NA setups.

The thread is 3/8" NPT.

Each sensor is supplied with the connector ready to be crimped / soldered to your loom

Price: £25

Postage: £3 UK - £4 Abroad

USB - RS232 adapter

Having tested lots of these adapters I have found this type works fine on various laptops, suitable for all MegaSquirt ECU's.

The driver is available here if you need it.

See here on how to setup an RS232 adapter.

If buying one of these when purchasing an ECU I can slip it in the same box, so no postage cost needed.

Price: £34

Price is when bought with ECU.

Built-in USB port

When ordering an MS1 or MS2 ECU you can now specify it with a built in USB port.

This means no adapter is needed, compatible with all windows versions, including Windows 7.

Driver download here

Bosch injector style plug

This is the standard injector plug used on most vehicles using Bosch style injectors as found on Fords, RV8's, etc.

Each item comes with a rubber boot and 2 crimp terminals for the cables, for best results are to solder the wire to the crimps after crimping.

If buying one of these when purchasing an ECU I can slip it in the same box, so no postage cost needed.

  • 101.5mm diameter - £30
  • 171.5mm diameter - £30
  • 209.5mm diameter - £35
  • Rover V8/TVR crank pulley with crank sensor bracket and VR sensor - £115

36-1 Trigger wheels

Wheels are lazer cut 3mm thick, 12.7mm diameter hole in the center and 8 radial aligning slots.

The Rover / TVR wheels are specially made to fit the various versions of pulleys that have been

fitted to the RV8's over the years. To ensure we supply the correct wheel / bracket, we require

a picture of your pulley. So please email me

Knock conditioner unit


  • 1 or 2 Knock Sensor Inputs with Isolated Band Pass Filters - designed to work within the frequency range of most OEM sensors.
  • Adjustable Sensitivity - The conditioner can be adjusted to ensure it triggers at the desired voltage level.
  • LED Indication - The case has a built in LED to show when knock has been detected.
  • MS ECU Compatible Output - The output is regulated to 5V making it compatible to directly wire to an MS ECU. This can also be used to trigger an external LED (dash board mounted) if needed.

Please remember that this is not a magic pill, if you have detonation then you have issues you need to address and cure!

See here for more details on knock and how to wire the conditioner.

Please see the MS2 Tuning website for details on purchasing this product:

Price: £8.75

30A Relay and base with 3 fused outlets

This is ideal for wiring the power to the fuel pump, idle valve, injectors, ignition, etc, so that your ECU controls powers them up with the fuel pump.

Although this is not strictly needed, it can be wired to allow power to come on to the injectors, etc, when the ECU see's an RPM.

This means wiring it into the fuel pump output, see here for a diagram. With 30A of control, it can feed most items that the ECU controls.