Yep, I drilled a couple 3/4" holes in the stock one to pass the wire harness's through and put the new one over the top, so I could use the factory clips.
What I'm gonna do is put some velcro up at the top to keep the gauge pod snug to the stock A pillar. Now it stays for a while and then the gap opens up. Hoping the velcro solves that, and will still be able to separate the two to get at the gauges easier. I don't like the look of those little plastic pins.