odometer & tripmeter not working

[-fm-]

hi guys,My e21 odo & tripmeter is not working. From what i read in many websites, it is caused by gears which are broken because the plastic become brittle over the years.from what i now, other models are also affected e.g e30...can u guys recommend good place to send for repairs?

 

[initialM]

My E46 328 meter button also faulty. Can it be repaired? How much the used one?