Bro! My personal opinion is "Forget" about the PDC stuffs....The sensor are damn pricey...!! One sensor cost around $350 X 8nos = ?????
Mine with PDC .....now only 1 sensor (gila babi) sometime can sometime cant...?? If one sensor spoilt .....all the PDC not work..!!
Maybe you can install camera or the old skool type of reverse sensor with sound (long lasting & cheaper)..