viper 5901 car alarm issues

hi guys i just had the viper 5901 alarm installed but the issue im having is the alarm never goes off no matter how hard i hit the truck..ive had it on for 2 weeks and figured i better hear what the alarm sounds like so i know if i hear it that its mines, i have the sensor installed has well and when i walk up to the truck it says protected by viper stand back..and i adjusted the sensor thru the remote but and have tryed all settings from 1 thru 15 and still nothing..i mean i can put dents in my truck and it never goes off..so im wondering do i have to take it back to the installers and they need to adjust it from the brain or whats the deal?

yeah i had the same issiue. what i did was tryed to movie the brain around to where it was touching metal sit would pick up a hit alot easier. but also i have a bigger car so i had to add another shock sensor so it would be able to pick up hits from the back of the car. hope this helps ya.