[west coast]

So I have had the same problem as Bobby, my data logs for the rpm is very squiggly. I tried almost every thing listed so far and gave up a couple of years ago on this. One thing that I did do was go back to my tach which is a 2 channel with drive line sensor, down loaded it and my logs looked clean on RPM. one thing that was mention by Tom I am going to try. if anybody gets there's fix please post how you did it.