As long as the holes match, should be OK. May need to replace idiot lights too, though, since output of sender to them may be different. But you may even have an OEM VDO version. For an alternator can be a different story, since the number of poles for a Balmar vs a Volvo may be different and screw up your tachometer readings unless you also replace the tach. Maybe ask VDO or at http://www.marineengine.com/ .