Need In Help Of A Link

OK I no this is not a car support place however
i am in request of a link for a site

OF HOW U CAN WIND THE SPEEDOMETER OF A CAR BACK

for example when u buy a car it says its done for example maybe 44,000 kms
right
well i need to know how towind it back so it says for example from 44,000 to 43,900
anyone now how

Its Called Wining Or Taking Back The Speedo
Thanks
😀

I AM Not going to use this inapropriatly i just need to do it on my car! which aint going to be sold