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Message: <blockquote data-quote="igotaRaptor" data-source="post: 2091761" data-attributes="member: 62637">Ok I searched and I may be wrong but I could not find anyone with this question.  Sooo, that being said I’m installing an Innovate PSB-1 boost and ARF gauge that’s all in one does data logging even has a shift light you can program.  All great.  So question#1 I need to get a tach signal wire so which wire on the injector harness is the negative? Purple seems to be a common color in the harness#2  I need a headlight signal so I figured cool back of headlight switch will work so when headlights come on it will dim the unit.  Is there a wire I can grab behind the dash or do I have I run a lead up to the headlight for this? I used a test light on back of headlight switch and I’m not getting anything from those wires which indicates it’s the headlight wire.I looked around any help will be appreciated.  I’m on my path to pro charging this beast</blockquote>