Originally Posted by barry123400

This has been bothering me a little as well. I want to install a 2.88 rear end from a 1985 but their speedo is electric. Except for the station wagons perhaps. You need a compatable speedometer from the donar vehicle in my opinion to give accurate speeds. I am not aware if a speedo shop can recalibrate our older speedo heads. It's either that or memorise a correction factor in my mind.