My original prototype didn't have this issue, and was using a comparator. However the alternator seems to be transmitting AC noise into the lines which messes it up the RPM reading when the truck current consumption changes (I've tried two alternators). The LM324 has Vcc of 5V, the signal it gets from the sensor goes from 0-8V under it's normal operating range, and if it goes beyond either limit for unseen reasons, I want the LM324 to take in instead of the micro controller. I probably should have been a little more detailed with my application. *This information is for general informational purposes only, we will not be liable for any loss or damage caused by the above information.Thank you guys for your replies. NXP is dedicated to innovation and customer satisfaction, and is committed to providing its customers with the best semiconductor solutions to meet their needs. The company's products are designed to be energy efficient, secure, and reliable, and are used in a variety of applications, including automotive systems, industrial automation and control, smart homes and buildings, and connected devices. NXP offers a broad portfolio of products, including microcontrollers, microprocessors, secure authentication ICs, power management ICs, RF and microwave components, and sensor solutions, among others. The company was founded in 2006 and is headquartered in Eindhoven, Netherlands. NXP Semiconductors is a publicly traded multinational company that designs, develops, and manufactures a wide range of semiconductors and integrated circuits for various applications, including automotive, industrial, communications, and consumer markets. Dual/Quad Low Power Precision, Picoamp Input Op Amps

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