Check your machine to see if menu "7.3 Progressive" and its submenus are displayed. If the menu is there then your pay table program supports progressive awards.
Next, if the progressive menu is there, refer to the 'Program Summary Report' for your SG chip to determine the part numbers of the Spectrum display and controller board you will need.
Where do you plan to mount the display ?
Mounted just like yours LOL - That's the one I remember seeing.

I don't have 7.3, but I do have Progressive stuff in 7.1.4
7.1.4.1. Controller Select
7.1.4.2. Progressive Display Setup
7.1.4.3. Stand Alone Setup
7.1.4.5. SAS Progressive Group