The Winbond W83L786NG is supported on lm_sensors' supported hardware, and has a proper kernel driver (w83l786ng.ko) in the kernel (2.6.25).
However, sensors-detect does not map to the driver. It maps to the 'to-be-written' driver. I have attached 2 patches, one which changes sensors-detect to have ng in a clause of its own, and one to do all the NR/NG/R/G versions as the ng driver. I assume that from the devices page the driver supports all, but as a conservative developer, and only having the ng version, I have submitted both options since I haven't tested the others.
Cheers!
-Steven Schveighoffer