I remember reading that there is a way to bypass the coin in setup and use a push button to apply credits but have been unable to find the info again.
If I could find ALL of the parts needed cheap enough I would go ahead and get them both working on coins / tokens or even paper money. I do not have a Bill Validator on either machine, I have pretty much all of the coin parts for one and none for the other. It is hard to think that I spent the last 20 something years of my working career as a computer tech / System Admin. A big part of the problem is neuropathy in my hands and not having a steady hand like when I was younger, add to that poor eyesight. I am not very good at soldering or reading electrical schematics. After living here in Las Vegas for so long and seeing all of the gaming machines go coinless my wife and I really do not want to play with coins or tokens.