Had some time to work on the small gauges.
- On the stock gauges, seperate the metal pod from the plastic face
- Gut the guage(s)
- Use a soldering iron to melt the plastic holding in the metal piece
- Remove plastic lens
From here it looks pretty easy! It appears that I can just use my trusty Dremel tool to trim the metal to make the gauge fit. Just drop the guage in from the front, secure it with the bracket provided by Dakota Digital, attach the metal piece back onto the plastic face and screw the metal pod back on, then install back into the dash. Piece of cake I'll take pictures this weekend.