Jim, your tach is not military, more likely an industrial application. The good thing is that because it's a cable drive it can be adapted to vehicle use, or re-faced and re-calibrated to higher rpm or even speedometer. It's the same needle that SW used on their Police speedos of the forties-fifties. They came with a curved lens originally. Usually they don't want you to remove the tag because it lists the factory 2:1 or whatever calibration spec.