The letter are separate pieces.
I learned this from center gauge pod maker, and FMC FRAP employee Chris Curtis (rest in peace my friend, you are still very much missed).....
He was gracious enough to research this when he 1st started making his pods, as he (and I both) desired to have that same material found above the glove box, to be the face of each of our gauge pods.
It was pricey material, even for him to acquire, but he did it. I still have those 3 three little 'SHO' letters lying around somewhere in the garage.