I was looking for some insight into which company makes a complete harness for 1975 Bronco that has a 1990 HO 5.0 Saleen EFI motor option.
As the others have alluded to, and you have sort of found already, nobody makes a complete harness for your set up.
Meaning that, the engine harness is standalone and has nothing to do with the main chassis harness, other than being interconnected at a few key points.
Other than that, you are talking about two separate harnesses.
At this point, nobody I know of makes a single harness that encompasses the vehicle and the engine.
It really wouldn’t make financial sense, given how many different engine management system systems are currently being installed in Broncos.
The only answer to that is a full custom.
Painless is still the only one that uses factory colors to my knowledge.
Northeast Classic is a Centech on steroids. Very nice and very much “pre-wired” if you will. But that doesn’t mean practically installed!

Along with American Autowire, those are probably all the most complete harnesses you can get, for a Bronco.
Painless and American Autowire probably have the most extra circuits. That can be an advantage in some installations I suppose, but it’s not completely necessary for a Ford EFI setup since the fuel injection system has very few required interconnections with the chassis harness.
Still waiting for 904Bronco to bring in a project that could use the NEC harness in question. Nod, nod, wink, wink, knowwhatimean?


That would give him a full compliment of “which harness do I prefer most on which vehicle on which day of the week except Sunday” and give us something else to talk about.
No pressure though…
