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Help needed - 2009 ecm tach output

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Old Oct 13, 2009 | 06:29 PM
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kingkingking
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Default Help needed - 2009 ecm tach output

Hey I am trying to install a shift light and I thought I could hook it in to the speedo, but according to my shop manual there isnt a seperate tach/speed input to the speedo - speed and rpm comes as serial data thru 1 pin.

Is there an rpm output out of the ecm or should I just pick up the signal on one of the coils?? Does anyone know if the ECM uses multi spark??
 
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