That should be about it, in theory (you could even do with one monitor). But the thing is that the MPC has 1/4" (quarter-inch) inputs and most turntables have outputs that are RCA (red, white, yellow). So you may need to get some kind of adaptor - not sure if i'm allowed to post links here but just Google "quarter inch RCA adaptor."
The only other thing I can think of is that if your turntable doesn't have a built-in amplifier, the level of the signal coming off it is going to be pretty weak for the MPC to pick up - I struggled with crappy sounding samples until I figured that out. Some kind of small mixer would probably be the easiest option (and it might solve the problem of converting your RCA into a quarter inch.)
Good luck, message me if you have any questions.