Trip,
If you have no cooling problems, there would be no advantage to your switching to an electric fan. I am assuming you are talking about taking the stock fan off and installing a puller fan. Installing an electric fan on a TR6 is usually done for one or two reasons, extra cooling (which you apparently don't need - ie, pusher fan in front of the radiator and leaving the stock fan in place, it really is questionable how much good this does, or a puller fan in lieu of the stock fan, which requires some thought and planning. The electric only fan is usually placed on high performance engines that want the extra 4-6 hp gain from lack of plastic fan bogging engine plus very small weight savings by taking off the fan hub and replacing it with an aluminum donut. I vote for no electric fan, leave well enough alone. Now, with Dan Masters' wiring harness, you must have the complete dash out. This is a slick harness improvement but not something that can be undertaken casually, as you probably already know if you have started the re-do.
Good luck.
Bill