RPM (Tach) wire and signal

Reply Subscribe

Thread Tools

09-11-2016, 08:44 PM

Alexander Startsev

Registered User

Thread Starter

Join Date: Jan 2016

Posts: 128

Likes: 5

Received 0 Likes on 0 Posts

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

Reply Like

09-12-2016, 10:28 AM

King Tut

Registered User

Join Date: Jul 2014

Location: Fort Walton Beach, FL

Posts: 2,629

Likes: 0

Received 53 Likes on 42 Posts

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

Reply Like

09-12-2016, 10:47 AM

haga888

Join Date: Apr 2015

Posts: 1,269

Likes: 2

Received 14 Likes on 14 Posts

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

Name: 9BB85E95-3FFE-444C-9ADB-523EBE1D63B6_zpsvr3rceyu.gif
Views: 2634
Size: 26.3 KB

Reply Like

09-12-2016, 12:32 PM

Alexander Startsev

Registered User

Thread Starter

Join Date: Jan 2016

Posts: 128

Likes: 5

Received 0 Likes on 0 Posts

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

Reply Like

09-13-2016, 11:21 AM

Reverant

Former Sponsor

Join Date: Feb 2015

Posts: 132

Likes: 0

Received 0 Likes on 0 Posts

Square pulses, 12V.

Reply Like

09-13-2016, 08:30 PM

Alexander Startsev

Registered User

Thread Starter

Join Date: Jan 2016

Posts: 128

Likes: 5

Received 0 Likes on 0 Posts

Quote:

Originally Posted by Reverant

Square pulses, 12V.

Thanks! One pulse per revolution?

Reply Like

09-15-2016, 06:13 AM

Reverant

Former Sponsor

Join Date: Feb 2015

Posts: 132

Likes: 0

Received 0 Likes on 0 Posts

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

Reply Like

RPM (Tach) wire and signal

RPM (Tach) wire and signal

Trending Topics