I am new at this forum. Please excuse me if this same post appeared earlier. I am not sure where it went if it did make it in.
I am trying to install a tach in my van but I am not able to find clear information on how I can do it. I have COP ignition, which adds complexity compared to ignition systems of the old days.
Where can I acquire the tach signal? I read that I might be able to pull it from my PCM (possibly pin #48) but it will be only 5v instead of the 12v I need. I also heard that I might need a tach adapter. I searched adapter manufacturer's instructions but they leave me even more confused.
Finally, I saw but did not capture a simple DYI test adapter made with a LED light that I can probe wiring to help locate the pulsing tach signal. I would like to make one of these so I can keep from screwing up.
Any help or advice will greatly appreciated.