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I recently have been working on a school project to read rpm speeds from several different locations on a Baja vehicle. I am using a raspberry pi zero w and am running the code through python. During my recent test I noticed that most of my sensors were working and reading accurately except for one. I have one sensor reading the output of a 3600 rpm engine, and the program was maxing right around 3000 rpm. When I tested with a separate commercial gauge the engine was in fact turning at 3600. the Hall effect sensor has a working refresh rate of 10 khz so I don't think the sensor is my problem but more likely either a setting on my raspberry pi or the coding. If I need to upload the coding I can do so but I'm thinking its something like a refresh setting on the raspberry pi. Thank you.