Help with alarm on 2000 Chevy truck

How can I hook up a simple alarm to a 2000 Chevy truck with factory keyless entry? All this guy wants is something to go off when the vehicle is tampered with, but he wants to keep his factory remotes. How can I do this this. I have heard of a simple type of alarm that is for added to factory keyless entry, can anyone help? Is there something I can do to add a shock sensor and maybe a siren or something like that? He wants to stay as simple as possible.

u can use A NORMAL shock sensor  all u have to do is supply power ,ground, then hook up the trigger wire to the door trigger        driver door ,tan   passanger door, orangeany help ask

Or you can get a bottom of the line alarm, that has only Shock sensor, Door trigger inputs, Starter kill and siren....but he'll have two remotes than...one for the Factory Keyless and one for the alarm.... but than you have a lot of wires to tap....If he just wants a Shock sensor and siren....Go with a Bulldog 2010...Everythings contained in the siren...It's cheap and Cheesy, but it'll work...Otherwise..Try talking him into a full on aftermarket alarm...Won't be any different than he has now, just more secure...Đễẳ†ђş 12\/ Ĵęśŧē®™

Has anyone installed a Hornet alarm that upgrades the factory keyless entry to an alarm?

you can use a automate alarm model 415 that works off the factory keyless entrey.it arms with pulse from the lock wire and disarms with the unlock wire .