Bhai its placed in engine, open hood and see which wire is going inside towards dash. Its usually at the back side of engine as its closer to dash.
If electrician installed any sort of speed sensor u will see a small chip with 3 wires coming out of it,
If chona lagaya hai than faulty sensor installed go back to the person who has installed it and ask him to solve the issue bcz u gave him money for a correct installed setup
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