All Micro Display Mods require a 5v supply. You can access the 5v supply from the game's driver board by using a Mezel Mods Power Adapter (included for WPC/WPC95, Spooky and DE) or another suitable auxilary power tap or supply (DK Pinball Power Tap, Pinball Life Power Board, PinHeck, etc).
Both the Mezel Mods Power Adapter or DK Pinball's Power Taps provide access to both 5v and 12v supplies from the game's driver board and allow for connection of multiple mods. If you are using an alternative, please ensure it provides access to both 5v and 12v power. If you're already using a Power Tap for another mod, you can also use a splitter on the Power Tap to run the MDM with the other mod.
Other power options to access 5v from places other than the game's driver board are external power supplies or wall wart adapters, but be aware that the display requires 5v.
For Modern Stern games, the 5v/12v auxiliary connection near the coin door can be utilized to power the MDM. You can use a splitter at this connection to power multiple mods, as well. The auxiliary option CANNOT be utilized on Stern's Star Trek. Plugging the Stern Star Trek into this power source will kill the display. Stern's Star Trek MDM comes with a Mezel Mods Power Dongle.
For titles using the Stern's SPIKE system, a SPIKE power tap is required (or an external 5v supply).