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Bouncy oem tach but laptop and logs 100%

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Old Jan 18, 2009 | 05:39 AM
  #1  
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Default Bouncy oem tach but laptop and logs 100%

Help !

My oem tach connected to tach output of the MS (spectre unit) is bouncing all over the place - sometimes it seems right then other times it just bounces

the laptop rpm is 100% stable, the logs show that crank input is stable

What have I done wrong ? the MS I have has the inbuilt tach output circuit
Old Jan 18, 2009 | 05:48 AM
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check your Sparks
Old Jan 18, 2009 | 12:42 PM
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why did you need that circuit?
Old Jan 18, 2009 | 02:26 PM
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What year is your car?
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