You have the OEM version. Go ahead and get a new one. The OVP causes hot starting problems only. Cold starts are fine. About $65 at FastLane.
Make sure you disconnect negative lead on battery before attempting any replacement of electrical components (make sure you know your radio security code, though). It may seem a little overcautious, but many of us have gone in to replace a 10-cent light bulb or fuse only to wind up frying out a $700 MAS or instrument cluster, or $400 climate control unit, etc.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car