i'll say it: Autobahn are f@$kheads.

If you can afford it get an auto electrician to do it... they cost more but your paying for quality and the time it takes for them to do it neat.

These accesory shops e.g autobarn, strathfield etc. just get anyold accessory fitter that is qualified in the art of "twist and tape" and can smack an alarm in 30-45mins and tape everything up inside you dash so you cannot access nor remove dash panels+ switches then to add to that on a really hot day when all the tape loses its adhesivness you end up with your alarm modules/wiring falling on your feet while driving lol

reality is, the siren is all you need to scare the young f@$ks away. the rest isnt really needed...