The glow material must stay sealed to keep the long life in tact. The small metal particles in the materials will rust, which them makes them not glow after a short period of time. Glue will not work to reseal the gauge materials because it will corrode the materials and discolor it... Expect half life or less with cut materials is what I was told by an engineer of an electro-luminecent material manufacturer.
In short, no, I would not cut them. They will work, but for how long is your own guess.
