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Tach rises while engine off?

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Old Apr 24, 2005 | 03:38 PM
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Default Tach rises while engine off?

Anyone ever seen this with an autometer tach?. Engine off, ignition on, the needle slowly rises. Am I missing something here? Green to coil (-), red to +12v. Black to ground , white to dash lamps...
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Old Apr 24, 2005 | 05:04 PM
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do you have an msd box?
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Old Apr 24, 2005 | 05:13 PM
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its because of the air core in the autometer tachs. when the electrical pulse is taken away when the car is turned off, it has nothing to keep it at the bottom


there is no physical part to keep it where it sits, or force it back to zero when power is removed

the reason autometer uses air core is because its extremly responsive
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Last edited by BLUE2KSS; Apr 25, 2005 at 09:04 AM.
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Old Apr 25, 2005 | 01:45 AM
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No msd box, running a Unilite dist. So 2KSS, this is normal on one of these?
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Old Apr 25, 2005 | 03:34 AM
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mine does the same thing
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Old Apr 25, 2005 | 09:03 AM
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yes, mine did the same thing, and the tach was fine.

i asked the same question when i got mine.

shit, for every monster tach ive ever seen from autometer they have done it
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