This circuit consists of an SN7402 or a non-gate integrated circuit, eliminating the need for an internal battery. If the car battery is 6V, the required 5V voltage can be obtained by using 50Ω in the Zener circuit as shown in the figure. If it is 300Ω, 12V can be obtained. This article gives the calibration procedure for engines with 4, 6 and 8 cylinders; select the maximum speed displayed, multiply by the number of cylinders, then divide by 120 to get the frequency in Hz.
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