FN41 -12V sensor vs MBM

anyone know the equation to turn the sensor value into a voltage? MBM's is quite a bit off. The BIOS reads nearly dead on.

Hey DZ if its anything like my 2 Shuttle motherboards then try ITE8712F Standard 4 under voltage configuaration. This gives readings that come within 1-2% of BIOS and Sandra on my rigs which is good enough monitoring for me personally.
Regards, Balrog

neg, the one below that (7njs?) is closest for me, and it's the only one with 9 voltages...
I've already tweaked the rest to multimeter values.