making a stand alone harness

[C2Motorsports4x4]

So I have an 04 LS L59 out of a Silverado. I have Red and Blue ECM connectors, but everything I find on my engine is Blue and Green?
Does it matter about the color connector? or am i just not finding what I need. Also the Injectors that came with engine are different than what I have on the Harness, can some one help please
IMG_4897.jpgIMG_4898.jpg

[dave w]

Possibly the information at LT1 Swap will be helpful: https://www.lt1swap.com/2000harness.htm

1999 ~ 2002 Computers have Blue / Red Connectors. These computers have 512K Memory. Most of these computers are Drive-by-Cable.

2003 ~ 2007 Computers have Blue / Green Connectors. These computes have 1024K Memory. Most of these computers are Drive-by-Wire.

Likely you have a LM7 harness (1999 ~ 2002), not a L59 (2003 ~ 2007) harness.

[C2Motorsports4x4]

dave w
Thank you for the information. I am sure I'll use the website for research.
I'm wiring up the engine to run in an off-road buggy. Never messed with an LS engine,
I'm a retired Diesel mechanic and familiar with electrical. Let the fun begin, sorry about the sideways picture.