hey, anyone know if is possible to find a electronic cluster panel(speedometer)

My car originally works with the chain speedometer, but i change the gearbox and the new one works with electronic speedometer, and rigth now I dont have my speedometer working...

any advice?

 

The 400e/500e use a electronic speedo, although it is calibrated for the associated differential gearing, you would need to make corrections for that aspect.

 

thanks!
I really want to see working again my speedo... but the gearbox donīt have any relation with the calibration? or it is only at the differential conversion?
I think maybe the both parts have relation...