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You'd have much better luck taking apart an old microwave oven and robbing the "gunn diode oscillator/ TED" along with a couple of other key components and assembling a radar jammer. If the car has a vehicle speed sensor, you could even program the jammer to throw out a signal that gives only a percentage of your current speed instead of the true speed when it senses a radar signal. Or simply output a fixed signal that will be displayed on the radar gun.
But this is old school technology. Most police use lasers instead of radar now.
If you've ever used a radar gun, or any speed estimating device for that matter, even for a couple of hours, you'd know that you can get pretty good at estimating speed and just use the radar/laser to confirm the speed. Usually you'd get your own estimate down to within a couple of mph.
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