Here's what I ended up doing:
Get rid of the push darts that come with the pillar. Go to Lowe's to the nut/bolt bins and buy some new push darts. I can dig up the part number of what I used later if needed. MUCH nicer than the ones that were supplied with my pod, which were a 1 time use POS (I've had to take mine apart several times now diagnosing a bad boost gauge).
Hold the gauge pod TIGHT to the factory pillar as mentioned above and drill 5-6 holes for the push pins, spread evenly as you can. Clip off the extra length of the push pins after you shove them in.
If you just test fit the pillar without screwing it in, it will look like there are going to be big ugly gaps. Don't sweat it, the screw will pull the pillar up into place and it will look just fine.