Try reinstalling the 737-200 Base Pack. Use the repair option when asked to either repair or uninstall it. If you are using Vista/Win7/Win8, make sure to install it using the "run as administrator" option - this is done by right mouse button clicking on the installer, csp732_1000.exe, and selecting "Run as administrator" from the list that pops up (it's 2nd from the top).

See if doing that gives you your gauges.