507T Tilt/Motion & 507M Tilt Revisited

Sorry for being long-winded.

I've just read every post here that references the 507T & 507M sensors. It appears to me that most, but not all, installs of the 507T have had issues with false triggers due to the motion portion of the sensor. Most of you who have posted about it suggest to set it @ low on the motion and 3 deg for the tilt.

My (professionally installed) Viper 5000 has gone through many sensor configurations before I finally ended up with the built-in shock and a 507T. Originally the 507T was set to high and 1 deg. and I was having only a few limited false trigger issues UNTIL, I had a 509U added. As soon as the 509U was added, the random false triggers from the 507T, which of course always happen in the middle of the night, began happening almost nightly.

I'm not convinced yet that the problem is related to the addition of the 509U, but believe that the 507T is an unstable unit. When it does false, it will keep triggering a minute or so after disarming and re-arming unless I bypass it for a couple of hours. So far I have changed the settings to 3 deg. and medium for the motion with no success. I'm now going to try changing to low, 3 deg. a 2 minute arm delay and will let y'all know. Some have suggested disabling the motion but that kind of defeats the purpose of the module; why not use the 507M then!

I also think that the sensor location is important. My installer located my 507T up under the dash, wire-tied to a flat surface directly below the steering column. The instructions mention that DEI recommend installing it on the floor of the vehicle. I'm in the process of finding a good place to try that, maybe by using Velcro on the hump.

As a note, so far I like the 509U much better that the glass break and radar sensor combo that I originally had. The 509U appears to much more stable than the radar. The glass break, well if the thief is going to break your glass, you can't stop that. With the 509U, as soon as a hand is stuck through the open (or broken) window, it triggers. I had the installer mount both sensors for the 509U up high on the A pillars. The directions call for pointing them to the center of the rear window so I made an "X" with masking tape on the glass and marked the center. I then used a laser through the glass and pointed it toward each sensor to position them. Works great!  

I have learned that with car alarms, more is NOT better. Sure it's great to have a bunch of sensors but when they start acting goofy, troubleshooting is a nightmare. And if f you're like me, your neighbors will start to hate you, not to mention your frustration and lack of sleep from middle of the night false triggers.  NOBODY in my neighborhood reacts ( the cry wolf syndrome) to my car alarming in the middle of the night anymore which defeats the alarm entirely. If somebody does try to bag the car now, my neighbors will think "Oh it's just that piece-O-crap alarm again"! This is not what I paid +$600 for.   On top of that, how about the wife in my ear about the money spent for something that doesn't work right, PRICELESS! Talk about your "warn-aways!"

Comments, ideas?