Using sparkplug cable for timing determination?

[Hutkikz]

Here is a good older post on this subject:

Reading pulses through Inductive Clamp

Hello, I have searched for this for hours but every post ends up leading down the path of "if you try this instead", or "This might work better for you". I have a small stand built to break in new go kart and mini bike engines. I need a RELIABLE tachometer to do this and I'm wanting to make the switch to an inductive clamp. I first used an optical sensor. Very fast, but had issues at high speeds with high vibration and it wasn't quickly adapted from one engine to another, I often had to make s…