I have one, it's just missing the black rubber band thingy that wraps around it. You can use one from any other gauge (Autometer usually throws in two per gauge). It is used but in perfect shape. Make me an offer and it's yours.
I have a lunar boost guage, but the calibration is off. It sets a 2psi when it should be at 0. If you are interested PM me an offer. i will let it go real cheap. Thanks.