Title: Works. But has internal short circuit that weakens spark for the wire it's attached to
Product review: Works just as it should. But has internal short circuit that weakens spark for the wire it's attached to, the result is that the engine doesn't run smoothly or at the correct speed when the light is attached. This might not be a problem with larger motors, however it makes it basically worthless on my 3-cyl Geo metro. My advice is just spend the extra 10 dollars and get one with an inductive pick-up as attaching the sensor lead to the spark plug wire is kinda a PITA too.
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