[randy500]

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.