Try this.
http://www.jammaboards.com/store/60-in-1-m...b/prod_212.html
I have one and it's a great space saver. They run about $100 for the board, plugs into any jamma harness game. Common mid to late 80's type. Also support the existing arcade monitor and VGA. No more pricey arcade monitors! Find a dead monitor machine on craigslist,stuff in a vga monitor and your golden!
I have that board and love it too!
We have 5 cabs now, but if I could choose one more it would be a sit down Tail Gunner!