Hi im considering getting one of these (https://www.ebay.co.uk/itm/143353152811) to give the illusion that my car has an alarm (as I'm too tight to fit an alarm also given the age of my vehicle its hardly worth the cost and hassle) but I want this to only get power (ie turn on) when I lock my doors and off again when I unlock the doors (like an alarm indicator would do) my car has central locking but does not have the electric boot catch and release system and is only opened by turning the key and locks automatically when closed so I need to know how and where would I link this into the wiring harness if I was to do it myself (I may get it fitted by a auto electrician in which case I may end up with a retro fit alarm)