Just my $.02, but I'd let the factory do it.
I had "alarm tech's" at visions do an alarm on my 1993 Subaru Legacy - and they royally f'd it up.
1st problem: worked find for about a month, then I noticed, on a random alarm test, that the alarm goes off, but I could turn up the radio LOUDER than the alarm went off. Easy fix, but the dumb@$$ didn't even tighten down the "siren ground" wire, just looped it around a bolt.
2nd problem: it's now winter, and EVERY morning going to start the car - my battery's dead. I figure out what the problem is - my brake lights were coming on as it got cold - so after about 2 months of pulling the brake light fuse every night, i finally found the problem. He afixed the alarm control module on some metal box under the dash (by my feet) with DOUBLE SIDED TAPE!!! The tape froze over night, and "lifted" pushing the alarm module against the brake light sensor, which turned them on. again, fixed with zip-ties.
3rd problem: car won't start at all. I have power this time, but nothing, not even a "click" from the starter. It WOULD however start if it was jumpered to another car. took it into the dealer because I have NO CLUE when it comes to wiring a car.... they manage to find that the alarm guy spliced in the alarm after the ignition - but didn't solder anything together, so the wire had come out of the contol module. $500 for them to fix that one.
And THAT diablo, is why i say let a dealer install - if something goes wrong, they'll be able to fix it (assuming you throw a fit in their office). not to say you're as dumb as whoever installed MY alarm - heck, you got into a forum, I don't think it would be POSSIBLE for you to be dumber than him - but imho too many things can go wrong.
2008 Jeep Liberty Ltd.
Red Rock Crystal Pearl - Sky Slider
Current Mods: None
Currently accepting donations to remedy above.