with John's help from you tube I was able to buy a non working Galaga and now its working great still need to redo the cabinet but thank you. I also have a sit-in hydro Thunder that I need some help with. the guy I got it from said he bought it at an auction and when he went to pick it up all the main pcb board where gone. I have the main computer, wheel driver board 04-11127 and Sound board 5772-15978-01. I did buy a operations manual but it doesn't tell all the parts does anyone know what else I will need to get this running?
Welcome to the forums and congrats on your Galaga! I don't know much about Hydro Thunder. I think eBay and KLOV would be good resources for finding the missing parts.
This is a great resource for manuals:
http://arcarc.xmission.com/