My harness was an off the shelf product made by Dynon. It is adaptable to several different engine systems. On one end of the harness is a 37 pin connector that is ready to go with heat shrink and the wire locations are not visible without taking it apart. The other end is loose wires (color coded). I connected my equipment using a color chart, and assumed the pins all had wires connected. My mistake was assuming, and not verifying.
The harness that Eddie got was custom made in a wiring shop.

John