Reset odometer to zero

My 71 duster turned out to be a major restore. So far, it has a rebuilt engine, rebuilt front end suspension, wiring, new brakes, a/c, starter, battery, wipers, upholstery, master cylinder.fuel pump, carb,power steering hoses and gear box all new engine mounts.
New 3 point front seat belts, audio system, gas tank and sending unit, muffler.

I am getting a working speedo from a friend, I would like to put it back to zero miles. with the exception of the xmission and rear end, it is a new old car.

any suggestions on how to reset the odometer. The title reads that the odometer is not original to the car.

Thanks