Looking for a reasonably priced fuel management harness for your 1997-2006 Gen III retrofit into your classic 30's through '80's classic ride?                                     

Looking for an easy plug and play set up with no guess work in the installation?

Looking for a custom "hand in glove" fit, with no unnecessary wiring and neat installation you would be proud of?

If your answer is "yes" to all three questions, then you have come to the right place. 

I can build and customize your fuel injection harness to easily to finish up your installation of the Gen III power plant in your pride and joy. The engine family (Gen III) covers the 1997-2006 LS1, LS6 and 4.8, 5.3 and 6.0L Vortec engines. The engines are identified by the knock sensors in the intake valley and the crank sensor (above the starter) has a BLACK connector only. 

This is not a trade in or rewire service.

These harnesses  are full-function harnesses that have ALL the connectors, just like the factory harness including the diagnostic port for scanning and troubleshooting. Made for older non computer controlled vehicles 1980 and earlier. later vehicles will require other modifications..  The harnesses are stock GM that are re-purposed from cores to build your custom harness.

Simple install involves hooking up power and grounds and engine sensors to get you up and running.


The harness picture is representative, varies based on the type of options.

                                          Two choices in purchase, without or without PCM**

Price for harness only: $469.99* which also includes shipping/insurance and delivery confirmation (U.S.A, AK, HI & PR)

Price for harness/pcm kit $579.99*  which also includes shipping/insurance and delivery confirmation (U.S.A, AK, HI & PR)



Shipping to Canada: $55.00   Notes: * prices subject change without notice.

Included at no extra charge:

BE AWARE OF OTHERS SELLERS ONLY SELLING "PARTIAL" HARNESSES! - No DLC, Fuel Pump Relay, Fan Relays etc, and hit you with hidden charges!


    LS1 style coil connector (L), and the Vortec style coil connector (R).

* These are needed if you do not have the coil pack sub-harness which attaches the main harness or if you desire a "neater" appearance.

                          Cruise control option only for drive by cable only- electronic throttle has built in cruise control.

NOTE: Support for the DBW (Drive By Wire) is available BUT you must have the correct throttle body, TAC module AND pedal for the model year engine. This is an extra cost option to supply ONLY the connections to the DBW devices.

                                             It is your responsibility as the buyer to insure you follow your local jurisdictions emission laws.





The PCM (service number 12200411) is used in my custom set ups and comes with the programming for a STOCK 1997-2003 LS1, LS6, 1999-2003 Vortec 4.8, 5.3, 6.0L engine, with all the unnecessary codes deleted. No custom "tuner" programming! 

            NOTICE                                                                   NOTICE                                                          NOTICE   

Later year engines from 2004 through 2006, use a different PCM with different calibration formats and must be purchased separately to match engine year. These can be purchased through me, but there is limited availability, please contact me first before purchase.

NOTICE!  I will need to know the following information, without it I cannot properly program the PCM to run efficiently.  

  The O2 sensor (L) is common to the F-body, while the trucks use the style on the right.

  LS1, LS6 injector connector (L). The Vortec style on the right. 

        The early engines used the 3 pin MAF (L), while the Corvette and Truck used the 5 pin (R)

       IMPORTANT!!!   This page has very helpful information on determining the proper lengths needed

MY PCM's are NOT locked, so you can do your own programming if desired in the future! ** If you have your own PCM, it will need to be reprogrammed to eliminate all the emission codes and other items not used on a retrofit project. If you need your pcm reprogrammed for the harness only kit, to get it up and running, you will need to send your pcm to me and it will be shipped back with harness. Cost....$50.


Installation instructions on CD is included, over 70 pages of basic installation and troubleshooting information.




Since this is a custom item, please allow up to 3 weeks   to ship. Thank you.  Shipping to the U.S.A and Canada only. Due to inability to  track and insure outside US or Canada, No international shipping.

This is NOT a factory replacement harness. The purchaser assumes responsibility in determining the compatibility with his/hers vehicle. Other parts may be required for installation.  

Not for marine applications or aviation applications. 1 year limited  warranty is provided for your satisfaction to the original purchaser, covering defects in materials and workmanship. Warranty information is available-click here. Read before purchase.


Payment: You will be taken to the secure page of Paypal to make your payment either through Paypal or Major Credit Card. Your personal information will never to revealed to me or anyone else.

NOTE: To provide quick service and prompt customer attention, this page may become inactive from time to time, to allow time between harness builds, for life, family and work. Thank you for your business and understanding.

Questions or concerns regarding this service, please email me at


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