FYI, that's a Double Dragon cabinet you've got there

See my restoration thread
here. I would KILL to have that cabinet -- the side art looks really good, apart from some touch up needed on the black. Mine -- not so much

Wanna trade?
Are you sure the monitor you have is an arcade monitor? Or is it just a regular computer monitor? Based on the fact that there's no mention of that model number anywhere on Neotec's website, I'm thinking that it's designed for VGA input only (computer monitor).
If you want to run the JAMMA board that's in there, you'll need something that will convert the signal to one that your new monitor will accept. The beforementioned converter should do the trick. But for less money and little bit of your time, you could just work on getting the original monitor working properly.