When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
That or cut off the plug and wire it to a switched source. Or you could get a female adapter and wire it to a source. That way you could still unplug it.
I recommend running a wire from a switched (and fused) circuit up the A-pillar to the middle of the windshield with the same connector as your cigar lighter cord. Then hard-mount an aftermarket universal detector clamp. It's much more solid and convenient, and you can still use the original parts if you use the detector in another vehicle.