Yes, I have a Blitz Dual Turbo Timer. It sets a base time (user controllable) and then has 2 add on timers. One for a selectable anount of time when achieving a user programmable boost level, or a second (which I use) which adds 130 sec for every hour of run time until shutdown.
The Stock alarm will arm with the TT running the engine. I agree that this is one of the best investments that a Turbo owner can make. I love it. The blitz unit has a display unit separate from the control unit with a long cord and connector so that the display can be mounted remotely wherever it fits best in your vehicle. I fabricated a bracket and mounted it above the rear vier mirror to operate as a heads up display (the control unit is under the dash behind the drop down panel under the steering column). Exhaust depot has them (where I got mine) for the best price that I have seen. Check out their web site
www.exhaustdepot.com 
Alan