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1991 FLHTP
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I'm going to venture a guess. I think they mean the short black should connect to a positive switched connection that is only hot when the ignition switch is in the on position. Same thing "G Man" said in his post #2 above. Long red is feed to battery that is hot always. Sounds like typical instructions written by someone who has limited knowledge of the english language.

Basically, the tach backlight and actual RPM does not do anything until the short black wire gets 12v from the ignition switch being turned on.
 
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