Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
What device do you wish to connect the SP-U speed sensor (99-76) up to? I'm not quite clear on that.
The listed compatibility of the SP-U 99-76 speed sensor, according to one eBay listing, is with
FishEasy2 (black conn), FishEasy 240, FishEasy 320C, FishMark 320,
FishMark 500C, FishStrike 1000C, FishStrike 2000C, SeaChamp 1000C DF, SeaChamp
2000C DF, SeaCharter 500C DF, SeaFinder 320DF, SeaFinder 480DF, SeaFinder 500C.
I think the question should not be about wire colors. It should be about the plug the speed sensor has on it if you *don't* cut the wire, and just use it in its undamaged state.
Were you thinking of just splicing to the cut wire ends? leading to your device... rather than running the uncut cable from the speed sensor to the device (whatever it is) that you want it to work with? If so, I would advise that a custom-spliced formerly-cut connection will give you problems, period, even if it works for once and a way.