Hi everyone:

I'm trying to figure out how to install an aftermarket alarm in a 1990 560sel. My main objective in this little project is to add the convenience of remote door lock/unlock for this vehicle. As i understand it mercedes uses some type of vacuum-actuated door lock/ unlock mechanism. Not sure if such device will be troublesome for an aftermarket alarm.

I have not purchased any alarm yet. Did a quick search on ebay and there's many cheap and generic brand alarms that costs little over $20. Not sure if these cheap alarms will be compatible with my car. So i'm still looking...

Please feel free to share your past alarm installation experience.

Thanks!

Mars