The volts should drop off at an idle to 11/12+ but at speed should climb into the 14 volt range if all is right. If it's showing 16, it's a bit high and will cook the battery as well as blowing some bulbs early on.
Harley Davidson specs is as follows: With a warm engine, oil pressure at cruising speed of 55 m.p.h. and up should be 30 - 36 p.s.i. At idle, at least 10 p.s.i. With initial start-up being around 44 p.s.i.with the colder oil temps.