> Unfortunately that particular line of cars sparks MORE than once > during a full four cycles, the second spark being weaker than the > primary. This makes it very difficult to reliably get a reading from > the spark plug line which is why I will use a direct tie in to an > injector line. Thanks anyways, TTYL Try the Hall sensor trick. Glue or attach a linear Hall sensor to the bottom of the ignition coil. The sensor needs electrostatic shielding (Al or Cu box or foil). This even works with magnetos except you need to get inside the body first. Peter -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics