# tach problem **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [June 9, 2008, 9:34am UTC](https://forums.speedlife.net/t/tach-problem/197919 "2008-06-09T09:34:12Z")\ **Posts on this page:** 1\ **Showing post:** 12
**Author:** ![stenseltizm](https://avatars.discourse-cdn.com/v4/letter/s/a88e4f/32.png) [@stenseltizm](https://forums.speedlife.net/u/stenseltizm)\ **Post date:** [July 1, 2008, 8:12am UTC](https://forums.speedlife.net/t/tach-problem/197919/12 "2008-07-01T08:12:34Z")
> [@FS: bseries turbo kit ALL for $350!! SOLD](https://forums.speedlife.net/t/fs-bseries-turbo-kit-all-for-350-sold/36942/9): > > when i had tach problems last summer, just for giggles i actually measured the signal to see if it was actin goofy from the distributor. i believe it was between 1volt and 1.9volts… fluctuating up and down for different rpm’s and i think it was seemingly backwards like 1.9v was around 1,000rpm and 1v was up neer the 8,000rpm area > > that could be completely backwards though so i’m not much help Aren’t tach signals usually a square wave of some sort? Depending on what you used to measure that signal that all could be junk data. A multimeter or volt meter will not measure a square wave accurately as there is a sample rate, then an averaging that takes place. You would need a scope to read that type of signal. --- _[View the full topic](https://forums.speedlife.net/t/tach-problem/197919)._