This remote battery holder is compatible with all pinball machines that originally used non-rechargeable double A batteries.
Compatibility List:
Williams System 3 through WPC-95
Data East - All machines
Sega - All machines
Stern - all Whitestar system machines
Installation is virtually impossible to do incorrectly. Simply install the active remote battery in any slot of your machine's battery holder in the same orientation as the original battery. Then place the two dummy batteries in the two remaining slots in the same orientation as the original batteries. See secondary pictures below for clarification.
Installation requires no tools and takes about 2 minutes.