Most of the needles are easy to set. The speedo is the only one that will be a challenge
1. Read over this:
http://www.therangerstation.com/Magazine/spring2009/odometer.htm
2. Hooked up to a new D-size Rayovac (I'm Cheap), the speedometer will rise from 0 to about 70-72mph. Use that as your baseline for setting your speedometer. Play with the needle, and you will get it really close to exact.
3. Install your cluster in your truck without the clear bezel. Idle your truck until it has warmed and the idle has settled. Install the tach, temp, oil pressure, and power needles.
4. The last step is to top your truck off at the gas station. Install the fuel needle just past the F mark.
This should get you close enough to the factory settings to be used normally.