Help!

I need to get an "over rev protection" module for my '88 560sl. I understand this MIGHT be behind the glovebox.

Symptoms: The car WON'T let the RPM's go over 3200. It stutters no matter if I'm driving constant, reving the engine at idle, or really stepping on the gas... whenever the RPM needle hits 3200. Up to that point, she really sounds/drives great!

Anyone have a clue about where it is and a part number? I've searched the archives and found nothing on a 560sl.

Thanks!
Michael b.