Like they said, pick a hot wire (at least accessory switched!), tap it, add a fuse, then the detector. Ground can go anywhere that's chassis AND metal.
I added an extra cig lighter socket to my car, with a dual usb charging adapter. I put it all under the console and ran the usb charging cables out the front for my phone and out the back for my camera.
no it didn't come with one, but there are directwire cords available to buy online for my whistler cr90, so i basically just have no idea where to begin as far as installing it goes.Did your unit come with a smartcord or other accessory that lets you hardwire it? Or is there one available for it? That's what I used with mine and it simplified everything.