Many suggestions have been made as to the best location for a radar detector in a Diablo.

Figure 1. Front radar detector under passenger side sun shade in Diablo

Clearly the simplest is to place it front and center on the windscreen using the suction cups supplied by the manufacture. While this is very simple to do, there are disadvantages. The unit is very visible, asking to get stolen. The power wire going to the cigarette lighter socket looks ugly and tends to get in the way of things.  The approach here is to place the detector between the roof and the passenger side sunshade running the power cord between the roof and roof padding. The LED display from the detector is also relocated to the roof dome light fixture. See Figure 1.

For those that want a more elaborate system, I describe below my experiences installing a second radar detection unit facing backwards through the rear engine grill of the car running a speaker wire lead and power from the front of the car.  This is to detect radar signals coming from behind the car.