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How can I get my speedometer to read true speed?

A friend of mine was in my car and started pressing buttons in my car and now when I drive my speedometer does not give the true speed I am driving

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Is your dash digital or analog

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My speedometer goes up and down , and my radio goes on and off

The speedometer can fluctuate rapidly under normal driving conditions when the car's speed changes abruptly, but sometimes the needle can start swinging around the dial without any fluctuation in speed. If the hairspring comes loose or breaks, it can't hold the speed cup in place, and the result is a fluctuation in the dial. In electrical speedometers, if the circuit that counts the magnetic pulses fails, it can cause the speedometer read-out to vary from the actual speed and to shoot upward or downward without notice. If a speed sensor in the automatic transmission starts to malfunction, it can affect the speedometer and cause fluctuations. In these instances, either the speedometer or the sensor needs replacement.

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It is probable that the cable for the speedometer is streached and your MPH reading is incorrect all or most of the time, get a friend to drive behind you at say 55 MPH so you will know the odometer reading ( may prevent speeding ticket )
All metal expands when heated and contracts as it cools. Your cable becomes slack when hot. Stay Safe!

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