Oh
Sorry
I get it now
As mr Bill said, you will need
Jamma PCB to Pac Men/Mr Pac Cabinet Adapter
This adapter will enable Jamma PCB to work in a Pac Men/Mr Pac 44 pins Cabinet
(your Jamma PCB need external power supply)
Product No. B-05
Then connect the "up" pin on the pacman adapter to the fire pin on galaxian
I have done that also