so, since the zv works successfully I would like to make myself to the electric window lifters on Monday, luckily my butcher volvo 106 kw has all 4 windows electric! Again, all original Volvo parts!! as well as a BC! Now I would like to install the BC for the first time, both have the VDO tacho!!! I only have to expand and connect the display with the switch for this purpose? are the cables already installed here? and to the window lifters, how do I know that the wire harnesses are already prepared? unfortunately all 4 windows are by crank! and to lay the cable tree would be funny ****