How do I add the temp sensor so I can obtain my cpu temps through my bios. As of now the bios provides me with the rpm's of my cpu fan, and the temperature of my mobo, but the cpu temp is N/A?

Is there a simple procedure to enable this feature?

Athlon 750 (classic)
Radeon 32MB DDR
30Gig Maxtor 7200rpm
128 PC133
SB Live X-Gamer
Asus K7V
Custom Case