This is the power adapter I designed for Data East/Sega/Stern machines.
It plugs directly in the 15 pins connector on the different power boards and you can plug the wire connector directly into the adapter:
VERSION 3: CN6
The 12V, GND and 5V are being tapped from the lines on the power board. They are fed to a 4 pin molex connector.
You can use the Colordmd WPC wire harness or make your own wire harness.
Note: the 5V should only be used for simple MOD's, not to power the PIN2DMD displays. The connector labeled WPC on the PIN2DMD PCB's will not accept 5V (not connected).
Only the 12V should be used for PIN2DMD shields or displays when using the WPC connector.
Data East: Version 3
Sega: Version 3 & Whitestar
Stern: Whitestar & SAM