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You need a JAMMA / trackball switcher. IT makes an official switcher but it is very pricey (I have one, I managed to pick mine up for a decent deal).
The cheaper multi-JAMMAs out there would work to switch the video but I am not sure about the trackball.
Here is the link to the HAPP page for the "official" switcher...
http://na.suzohapp.com/amusement/gameparts/95086200.htm
EDIT: Holy crap that is an insane price... I paid no where NEAR that... thankfully.
I am going to be doing this same thing with my Golden Tee 2005 and The Simpsons Bowling. I'm going to be using a Mike's Arcade switcher and interfacing the two games' trackball connections via some in-line diodes. Should work the same as the Multi-MK setups where the diodes block the feedback grounds from the other boards. Should be able to simply install them in-line with the trackball wires where the trackball will work with both games. I'll see if that process works or not shortly and report back. Could save you $400.
only problem is that isnt golden tee medium res? and simpsons bowling standard res? or are you just playing both at standard res? how much worse does golden tee look?