I don’t think those dip switches will change anything you think it will. I thought there was a manual for the 906 board in the file system. Im pretty sure you don’t want to change them.
Edit: there is indeed a CEI manual that has a dip setting guide. At the end it says it is for 906 which is compatible with 905 machines. If you are a contributing member it is available to you. If not I suggest making a contribution or setting up for recurring. This manual alone would probably cost $25 or $30.
The manual is titled:
CEI Video Poker Owner's Operation Manual ver 51.03