GagePort Multiplexer A single GagePort Multiplexer holds up to 4 GagePorts. Two (2) Multiplexers can be connected to each other, allowing for a maximum of 8 total GagePorts all connected to a single PC. By connecting eight 4-Port GagePorts into 2 MultiPlexers, you can have a total of 32 gages all connected to your PC. The GagePort Multiplexer uses a GagePort Power Supply to power the unit and to connect to a PC's serial port.