You can change the size of the complete indicator 'real estate' on the portal by going to the 'display' tab in the indicator.
You can utilize dynamic gauges and change the gauge size by selecting the 'Select' button on the right of the gauge type drop down list.
You can also use this same area to change the format of the data displayed with the dynamic gauge.
As for size (8pt, 12pt) & alignment (center, left justified) of the data, these options are not available.
Note that if the dashboard doesnt have an indicator that matches your specific needs, you can also create a SAS stored process to create the display and have that surfaced through the BI Dashboard portlet. See the 'Stored Process' section of
http://support.sas.com/documentation/cdl/en/bidbrdug/61856/HTML/default/n1ft1fnpq8qa7on1vy9593s74h2w....
~ Angela Hall
http://sas-bi.blogspot.com