personally i would highly recommend going to a good installer as alarms can often be a huge pain in the ass to install and ive done 2 and that was enough for a lifetime. Not to mention hanging the shock sensor properly etc.
The 5904 is a good unit i've owned the 5901 a few years back.
is it really that hard? i have never done it but it cant possibly be so difficult. i hate paying for shit that i can do. also i have alot of experience with wiring things together. i do it almost every day at work but not automotive related ofcourse.
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