New Alternator Output Voltage

What is your question?

I just replaced the Alternator in my 1990 325i. All is fine but have a question about the output voltage to the Battery. According to the meter with the engine running, the battery is getting about 13.7 volts from the Alternator. Is this enough to keep the Battery Charged and Operate the Engine's Electronics? Should it be 14+. If so, is there any kind of adjustment at the Alternator to increase the Voltage? I bought the new Alternator at NAPA for my Vehicle, the BOSCH 90 Amp NAPA Part# NAE14813. Thanks