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deleted-
I spent four hours doing mine but that is because I buried it where it cannot be easily found and the same with the Immobiliser circuit :)
It has alarm features as well so some of the wiring is not required depending on what you want.GPS aerial, GSM Aerial, Microphone, then Battery live, Ignition live, earth, four wire immobiliser with the relay, the rest is optional.
I have a 500m perimeter set on it around my home as soon as I drive out I get a text, so if it gets stolen you get a notification too :)
Pay as you go Giff Gaff sim purchased separately set up to auto top up :)
Fixedwheelnut
Uses GPS and a SIM card, phone your car and it will text back with a Google map link where it is, also if you wire in the immobiliser you can text a message to cut it out, either instant or safe once below 10mph :)
https://www.amazon.co.uk/Tracker-Vehicle-Theft-Protection-System/dp/B003XDN58K/ref=sr_1_5?s=automotive&ie=UTF8&qid=1476566764&sr=1-5&keywords=gps+tracker