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RPM (Tach) wire and signal

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Old Sep 11, 2016 | 08:44 PM
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Default RPM (Tach) wire and signal

Hi. Where do I get RPM signal and what is it? Is it a wave, pulses, voltage level or what?
Thank you
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Old Sep 12, 2016 | 10:28 AM
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http://www.modifry.com has instructions for places to find the tach signal for their shift beeper install.
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Old Sep 12, 2016 | 10:47 AM
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I tapped #25 from the ECU in the drivers kick panel.

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Old Sep 12, 2016 | 12:32 PM
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Thanks!
Any ideas of what actual signal looks like? Sinus? Pulses? Voltage level?
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Old Sep 13, 2016 | 11:21 AM
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Square pulses, 12V.
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Old Sep 13, 2016 | 08:30 PM
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Originally Posted by Reverant
Square pulses, 12V.
Thanks! One pulse per revolution?
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Old Sep 15, 2016 | 06:13 AM
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Yes, so at 1000rpm you should have a signal with a frequency of 33Hz.
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Old Sep 16, 2016 | 09:42 AM
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Originally Posted by Reverant
Yes, so at 1000rpm you should have a signal with a frequency of 33Hz.
Thank you! What about VSS wire and its signal? I figured to make boost controller with variable boost for different gears I need that as well...
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