I tried aeroserver 737 and could not get it to work with the current version of FSUIPC. If you should an active connection on the server side with FSX, then on the guage side do a right click and choose select server and enter the IP address of your FSX computer.
Like I said, it may not be the problem, it may be that FSUIPC is not talking to the aeroserver software.
Good luck.