Continued...
DIP switch soldered in and the far right row soldered up although nothing is in it. That step isn't really necessary but it's habit, so I did it.
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Here's GM's supplied chart for use with their recalibrating kit.
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DIP switch set with 1,4,6 OFF – 2,3,5,7 ON – corresponding to settings on the chart for 3.42 gears and a 225/75/15 tire.
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Sharpie warning on the back of the cluster to not attempt using a GM reprogramming kit on it (in case anybody happens to have one) as it will no longer work on this modified cluster (actually, a programming clip WILL still work, though there's no need to zap the fuses anymore since they're gone - just set all the DIP switches to "OFF" for the same effect. However the DIP switch makes it pointless to bother with a programming clip anyway.)
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What I usually do at this point is leave the front of the cluster in its current disassembled state, but with the metal plate reinstalled on the back – install it into the truck, temporarily mount the speedometer by plugging it back into the cluster but leaving the screws out, and go verify the speedometer reading against GPS. If it's accurate, then go ahead and put all the pieces back together and you're done.
Richard