I'm trying to make a gauge cluster for my older motorcycle. I was going to use a hall effect with a magnet on the timing wheel (a wheel that spins 1RPM per 1 engine RPM) but as soon as I turned the engine on the hall effect went nuts. The ignition coils and spark plugs are causing a lot of noise!
Here is the hall effect sensor I was using.
Is there a way to clean the signal up? Is there a better hall effect to use?
Finally, I know there is another way to detect RPM based on an inductive pick-up on the spark plug wire. I have read that you can use an LM395 with the wire wrapped around the spark plug wire and then connected to the base of the transistor. But that is all the details I got. Can someone shed some light as to how I can try this?