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Old 05-19-2018, 04:05 AM   #2
randy500
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Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,675
Re: Solved - Tach signal from Cummins crank position sensor

So just before I tried all that stuff yesterday I found a post where a guy used this "pull up" circuit with a resistor on a Cummins install in a square body with a video of the factory tach operating, its on YouTube...I wish I would have found that last December when I was researching this and before I bought the Autometer diesel tach, I posted the above explanation and my test results as a culmination of what is probably 20-30 hours of searching and reading posts on Cummins crank position sensor output and getting a tach signal from the crank position sensor...whatever it was fun searching and fun seeing finding the bits of information and testing it out. I will find the squarebody tach video and post a link here.
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