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  • Standard order lead time for STANDALONE WIRING HARNESSES is estimated to be 10-12 weeks from date of purchase.

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24x E40  Standalone Harness Manual

24x E40 Standalone Harness Manual

A standalone harness for those using an LS 24x E40 engine with a manual transmissions.


  • Speartech standalone wiring harness with labeled connectors and hook-up wires
  • Harness grommet
  • Instructions

Choose your options:
Sending in ECM/TCM for reprog.?(required):
Air Conditioning(required):
Year/Model of Donor Vehicle(required):
Special Notes(optional):
Add MAF Sensor?:
Add O2 Sensors?:
Gear Ratio/Tire(required):
Pedal Connector(required):
Emissions Wiring(required):
Front End Drive(required):
Examples are Holley, Wegner, CVF Racing, Drive Junky, etc.
Product Code: 24xE40_Manual
TBSS pedal will only work with a TBSS E40 ECM.
GTO Pedal will work for either GTO or Corvette tune.
Corvette Pedal will work with GTO or Corvette tune only.

*Computer shown in picture are not included in the package*

Common E40 pullouts typically consists of one of the following:
2005-2006 GTO
2005 Corvette
2006 Trailblazer SS

*We do NOT sell E40 computers here, you must have the computer from your pullout vehicle for reprogramming*
*Computer show in picture are not included in the package*

This section provides detailed descriptions of the options available to you when ordering a harness. This will follow the "Choose Your Options" area above.

Emissions Wiring: Our harnesses come standard with no emissions wiring (Post CAT O2s, Purge, EVAP, etc.). If your project requires emissions, you can select what you need here. All harnesses come with pre-cat O2 wiring, as these are required for proper operation

Sending in ECM/TCM for reprogramming?: Select 'Yes' if you are sending in your ECM/TCM for us to reprogram them. Once reprogrammed we will test your ECM/TCM with your harness on a test engine here to ensure proper functionality.

Use the Special Notes field above to let us know any engine modifications and gear ratio/tire size. Refer to the Special Notes description below for more info.

Air Conditioning: If you are planning to use air conditioning with your project, then you want to select "Yes" here. Select "Yes" if using the GM A/C compressor only. When using a Sanden A/C compressor, choose "No". Sanden uses a 1-wire compressor that you tie into your aftermarket A/C system.

Special Notes: This is the area you will want to use to let us know about anything that would be important to us to know when making your harness. Such as which intake manifold you're using if not using the one that comes stock on your engine - like if you're using a car style intake manifold on your truck engine. Or if you're using a "Hi-Ram" style manifold. Anything that may affect connector placement, etc.

Let us know the Year/Make/Model your engine and transmission came from, as well as the Year/Make/Model of the vehicle you are swapping this into.

This is also the place to include any engine modifications (Cam, headers, etc.) as well as your gear ratio and tire size if you are sending in your ECM/TCM for reprogramming. If gear ratio/and or tire size is not known, everything will still operate satisfactorily, but shift points and speedometer may be slightly off. This info helps us program the ECM specific to your vehicle. - Modified engines will require a fine tune by your local tuner. We provide a base tune only. Even with a stock engine pullout that's not modified fine tune could be needed by your local tuner to get dialed in.

If you are sending in your ECM/TCM for reprogramming, just select 'Yes' above and send your item(s) to us and include a copy of your invoice that is emailed to you after you checkout.

Speartech Fuel Injection Systems, Inc.
Attn: Reprogramming
3574 E. State Road 236
Anderson, IN 46017

Add O2 Sensors: You can add on a pair of the proper front O2s for your harness. Just select "Yes" and we'll include the correct set for your harness!

E40 Instructions Manual.pdf

These instructions will also apply to this E40 setup