The wheel will turn a given number of revolutions in a mile,the rolling curcumference (piece of string around the outside and measure)divided into a mile should give you pulses v distance.
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Cost : Little as possible.
Thanks : To those who by their generosity my build has progressed.
Its a handmade sports car not a flaming kit car !!!
If at first you dont succeed,avoid skydiving...
No parachute require to freefall,only if you want to do it twice.
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