but the original one doesn't has some proprietary features ? Like the informations on the FIS ?
Because on the other side the aftermarket are affectively less expensive.
I've seen a model (aftermarket) with 8 sensor (I suppose 4 in the fron end 4 in back) with a little monitor composed by a 2 display of 7 segment each one and two led bar. The form seem to be an half-moon.
In the Passat where I can mount it without destroing all the car ?
according to the description above, it doesn't seem like the back-up sensors actually have a display, just a beep. i'm not too familiar with the oem system...if it does indeed integrate into the dash display, then i'd say by all means, go for it, but verify that before you buy.
with regards to where to mount it, i mounted mine on the dash.