What controls my electric tach meter on my moped?

The electric tachometer on your Moped is typically controlled by a combination of the bike's engine and the electrical system. When the engine runs, it generates power that is then used to operate the tachometer. The tachometer measures the engine's revolutions per minute (RPM) and displays this information on the gauge. This can be useful for monitoring the engine's performance and ensuring that it is running at optimal levels.