I think only the guys@empeg definitely know.

But I guess that you'll have to remove the slide-bay.
If you take a look at the back of the empeg here or here you can see that the Mk2 has only home powersupply, home RCA-jacks, USB, ethernet and serial and the docking connector.

The wiring for the tuner will be directly on the sled like the whole wiring for the power and the output and mic and everything else (ISO-connector), too. So there will be no other way than to remove the slidebay to connect the tuner. (Instead of reaching the back of the dash somehow - But I couldn't do that in any car I ever had or installed a car-hifi-unit. No space at all...)

But I think it's not too hard to do that. Don't worry too much about it.

TeeMcBee