If you have a tip on the black bar (see photo , supposedly pixel error in the display ) in the kilometer display ? Would you like a workshop that gets that or a private contact . The tachograph otherwise works perfectly . Also the km display ! Only there is this permanently existing black bar available . Have received a variety of different statements : 1. This cannot be eliminated 2. If two tachos can be sent in , the kmStand of the now installed tachos can be read out and taken over into a used tacho. 3. With a used tacho the km-Stand cannot be changed. The displayed is fixed ! Thanks for your support !