I will clear this up DO NOT drill 4 holes into your rear bumper it will not work. Before I put my NAV. and backup camera in my local installer convinced me that the 4 sensors would work [ it didn't ]. I now have 4 holles in my rear bumper. Let me ask a question my local installer is going to replace ny rear bumper but he keeps telling that it is not available for purchase yet is this true? By the way I did check with the local Hummer dealer and they are installing the 2 sensors in the rear bumper and they are working fine. It just dosen't have the range of the 4 sensors.
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