Your machine would have had hard meters originally, they are pretty much required by all gaming regulators and casinos as a security thing. Also it lets the casino keep track if the machine is earning its keep or time to remove it from the floor. Here's where they are on some models. Someone may have removed them for some reason, sometimes people don't like the clicking noise. On some machines if the meters are removed or disconnected there has to be a bypass jumper added so the machine doesn't have an error condition, not sure about an S+.