speedometer calibration query

[brens-e200]

hi all,

just picked up a lovely 1990 E230 on thursday last ( very happy with it but sadly i will have to put my 190e up for sale to make room ah well such is life ).

the previous owner stated that he had the speedometer replaced as it stuck a number of years ago ( he even had the original in the boot ). on the way home the speedo did indeed feel that it was indicating above what speed was actually been felt in the car.

So today i did a comparison between the speedo and a gps unit and there is a huge difference

rough figures

speedo 120kph gps 100kph

speedo 60kph gps 50'ish kph


so am i correct in assuming that if the speedometer is replaced it must be calibrated and if so is it a DIY tpe of job or do i have to bring it to a dealer ?


thanks in advance

brendan

 

[BlackC55]

Just buy one with the same part number as the old one. I don't think calibration is possible.

 

[mct_cars]

W124 or W210? W124 was mechanical and I have one in the garage......