Just wanted to drop a line that couple of month ago I adapted sensors code to head version of FreeBSD and I’ve been using it since then. I am using only it(4) driver though, and not doing anything fancy.
As such I made couple of small improvements to it(4), including support for 16-bit fan speed counters.
Here’s my current diff against head:
http://people.freebsd.org/~avg/sensors9.diff