Hi I bought a PowerMac8,1 and added this support, based on what I found in tda(4). It's been lightly tested but it seems to work okay so far. One thing I've noticed is that while the fan speeds are set independently hw.sensors.smu0.fanX always shows a common value. I've not looked into that further. Patch linked below because I believe Gmail will consume the tabs otherwise.
https://gist.githubusercontent.com/djwmarks/026cf7aae59b20591366/raw/b8d9a6252715d69849c695c284ca5a8ac5299516/gistfile1.txt Cheers Dominic
