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I am still trying to install an autometer tach in my s13. I connected tne green wire to the yellow/red wire and it did not work.
Any help.
 

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get a test light and hook your signal wire to the negitive side of the main coil when u hook the test light up to it it should blink very quickly thats how the tach will no what rpm u r at try it and lmk
 
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