Maybe it's mostly older stuff that have them. It could be hidden in behind the face itself. My granada clocks had a pot ( not all ages did though ), and my old Volvo clocks had one too.

But if there are only two wires going to the coil of the swing gauge, it's easy to trim them down to read lower using an adjustable pot.
I guess with more electronics skill than I have ( almost none ) you could configure them to read higher too.