Worst part of the job was fishing all the wires, tubing, etc down through the fire wall. When I had my 01, I installed the same pod. I removed the factory pillar cover, elongated some holes to run wires, tubing, etc. Then I drilled several holes for the push pins, reinstalled the factory pillar cover and then used the plastic push pins to hold the gauge pod to the factory pod.
The pod stayed in place, no problems. Leave yourself enough slack in your wiring so you can pull the gauge out of the pod should you need to change a bulb. Hope this helps you out.
Glen