To anyone who did not get the foam tape or rubber bands for installing the gauges, this is what you can pick up to use. Should be 1/2" wide and it is made of foam which is about 1/16" thick. Leave the backing on the outside of the tape so it is a friction fit (non-adhesive, makes for easier adjustment and removal, and will still stay in place perfectly).
I had been using two rubber bands on each gauge, and the fit was good, but not perfect. The gauges stayed in place fine, but if you grabbed them you could wiggle them around in the pod. I took the bands off, and installed one wrap of the foam tape. The gauges slid right back in and it was a PERFECT fit. Very tight, and no wiggle at all. Just loose enough you can still turn them to align the gauge without forcing anything, but tight enough that they feel rock solid. Highly recommended for mounting.