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Old 01-18-2009, 06:39 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
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Old 01-18-2009, 06:48 AM   #2
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check your Sparks
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Old 01-18-2009, 01:42 PM   #3
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why did you need that circuit?
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Old 01-18-2009, 03:26 PM   #4
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What year is your car?
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