1993 toyota corolla speedometer stops then?

rockin r

New member
went to get transmission serviced after a couple of days my speedometer quit working that is until i reach about 55 mph then it shoots up to 60 when I slow down about 40mph it just falls. been this way for about a month until last night...Seems to be functioning perfectly until the next morning right back to the way it was not working. Where is the cable located? or is it electronical? or could the transmission shop of done something? or please help I am at a lost of options...
 
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