I am installing a compustar 2w8000fm-as and am having probs with the shock sensor. I have set it to max sensativity and it doesn't go off or it goes off by itself. It is a hardwired unit. Just plugs into the brain, so it is not a wiring prob.I don't deal with compu that often. Is there a specific way to install the sensor? I think it might be a bum sensor. Any advise would be appreciated.