I just started playing with this myself recently... I have lm_sensors installed which came on the RedHat 8 CDs.
Basically all I did was typed in "sensors-detect" as root and answered most questions with the default answers. When it gets done it gives you a list of things that need adding to /etc/modules.conf and some other commands which need to be ran from a startup file. I added those to modules.conf and the others to /etc/rc.d/rc.local
Then just type "sensors" and you'll get back a lot of info.
After trying this on various motherboards I've discovered that occasionally the sensors-detect run will have you doing modprobes for 3 or 4 or more different chips on the motherboard which can return information. Even the eeproms on SDRAM DIMMs. I only wanted voltage and temperature from the motherboard so I deleted some of the extra stuff from the modules.conf and rc.local files.
Hope this helps!
PS. Here's output from my home machine:
# sensors
w83782d-isa-0290
Adapter: ISA adapter
Algorithm: ISA algorithm
VCore 1: +2.04 V (min = +1.80 V, max = +2.20 V)
VCore 2: +1.53 V (min = +1.80 V, max = +2.20 V)
+3.3V: +3.40 V (min = +2.97 V, max = +3.63 V)
+5V: +5.07 V (min = +4.50 V, max = +5.48 V)
+12V: +11.86 V (min = +10.79 V, max = +13.11 V)
-12V: -11.72 V (min = -13.21 V, max = -10.90 V)
-5V: -5.26 V (min = -5.51 V, max = -4.51 V)
V5SB: +5.11 V (min = +4.50 V, max = +5.48 V)
VBat: +2.08 V (min = +2.70 V, max = +3.29 V)
fan1: 4821 RPM (min = 3000 RPM, div = 2)
fan2: 7180 RPM (min = 3000 RPM, div = 2)
fan3: 0 RPM (min = 3000 RPM, div = 2)
temp1: +28°C (limit = +60°C, hysteresis = +50°C) sensor = thermistor
temp2: +28.5°C (limit = +60°C, hysteresis = +50°C) sensor = thermistor
temp3: +33.5°C (limit = +60°C, hysteresis = +50°C) sensor = thermistor
vid: +2.00 V
alarms:
beep_enable:
Sound alarm disabled
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