RPM (Tach) wire and signal

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Sep 11, 2016 | 08:44 PM

Alexander Startsev

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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

Sep 12, 2016 | 10:28 AM

King Tut

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From: Fort Walton Beach, FL

http://www.modifry.com has instructions for places to find the tach signal for their shift beeper install.

Sep 12, 2016 | 10:47 AM

haga888

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I tapped #25 from the ECU in the drivers kick panel.

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Sep 12, 2016 | 12:32 PM

Alexander Startsev

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Thanks!
Any ideas of what actual signal looks like? Sinus? Pulses? Voltage level?

Sep 13, 2016 | 11:21 AM

Reverant

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Square pulses, 12V.

Sep 13, 2016 | 08:30 PM

Alexander Startsev

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Quote:

Originally Posted by Reverant

Square pulses, 12V.

Thanks! One pulse per revolution?

Sep 15, 2016 | 06:13 AM

Reverant

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Yes, so at 1000rpm you should have a signal with a frequency of 33Hz.

RPM (Tach) wire and signal

RPM (Tach) wire and signal

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