The cable and gear in the transmission are keyed so you have to line up the key for it to work properly. Im not sure about the speedos being calibrated different between auto and manual though. I put an auto speedo in my car and its off by about 12 MPH but if I drive at 60 MPH for 60 seconds it go's
1 mile. Ive checked the speed with at least 3 cars theirs agree and mines slow.
Don't worry the cops know how fast you are going they just like asking that questions like that to get you talking and see how your acting. It doesn't matter if you answer yes or no to how fast you were going. I tried the "My speedo doesn't work" with the cops before and they said that its not required by law to work and I got my ticket anywayz.
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