Issues with Eygo 19" Monitor

[dsfrancis]

I am trying to build my first MAME cabinet. I purchased an old Mortal Kombat machine that someone had repainted - there is an Eygo 19" CRT monitor installed in it at the moment, but I am having some issues with it. It powers on, but the image is shown 3 times on the screen. I've tried adjusting the couple of controls that I have access to to no avail. I have attached a pic of what is happening. If at all possible, I would like to save/repair this monitor, but if it is not saveable, what would be the best way to replace it?

https://flic.kr/p/CYLKg6

[Kevin Mullins]

but the image is shown 3 times on the screen.

Sounds like you are supplying a VGA (31khz) signal into a CGA (15khz) monitor.
Research a video card like ArcadeVGA or software like Powerstrip or Soft-15khz. 

I don't personally mess with this sort of thing much, so maybe others can be more specific.

[dsfrancis]

I'll look into that software, but would something like this help?

http://www.amazon.com/gp/product/B001CJOLBW?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00