interestingly i have about the same setup, NH 1520 with 19 pto hp and a 25kw generac. my experience is about the same as far as fuel consumption, and setting the freq. meter to about 62Hz. there isen't a governor on my tractor, bur just upping the speed to 62 from 6o Hz takes care of the variations in load and motor startup.
i think that the frequency meter is much more sensative than the volt meter built into the generator, you cant rely on the pitch of the motor to tell you if you are at 60Hz. i would recomend that anyone who has a generator should use a frequency meter, available for about $50 from radioshack or other mailorder places. poor frequency will be extremely detremental to electronics and motors, refrig/freezer/well pump etc, had a friend that was off the grid for several years, burned up a few appliances until he figured it out.
also agree on the transfer switch option, people are selling them on ebay for under $100 since y2k over, no excuse not to have one. those gentran/emergen type units are easy to install, if you can twist two wires together you got it made.

good luck,
al

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