Just a note on some of these, I think there are alternate bezels for ALG games in Europe,l since they were distributed by Atari. Certainly Mad Dog 2 had a little sticker for the gun holsters on the deluxe cab, that gave a vital gameplay hint that was missed off the disc. There may even be a Japanese Capcom bezel out there for it
As for COPS, the lights are the only clue as to how many shots and lives you have, there's no OSD other than the bullet mark itself (cheapass hardware FTW). There's also an alphanumeric display at the base of the screen for scoring etc.