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Its normally incorporated in the front hub ,wheel bearing and ABS If not there then it will be a potentiometer in the gearbox.
The instrument panel will be printed circuit so you will be unable to do anything to it.
If the speedo isnt working it will be one of the items mentioned in last chat
I hope this is of use to you.
Please keep me posted.
I will opt out good luck
Good luck all for a good cause