Using the stock pcm, and trying to get a tach signal to a new SUN Retro tach..
I called their tech desk..He said the tach needs a 5v sq wave signal, and to check the wiring for correct position.
White wire/pin 10/green connector is good to go.[In correct pos., and has continuity].
I pulled up the tun file, and see that the tach parameters are checked as having a y/no choice for a 12v pullup signal. It is now active.
**I checked the signal for a 5v sq wave, but was using my Fluke VOM.. Got 0. Probably not fast enuf to trap that signal???
**Is that something I need a scope to look at?
**Would having the 12v pullup active, be interfering w/ the signal??
THANKS!