It depends on where you want to park and where you want to tailgate.
The major parking area #1 on the map is I believe strictly reserved for members of the BRAA.
The two major tailgating areas are #2 and #3
#2 is "RV Row" and being next to the BRAA parking lot, it is where the majority of BRAA members tailgate. This is a bit of an older crowd, but there are still some pretty rowdy tailgates over here. It is a pretty large tailgating area and if you get there fairly early, you should be able to park in #6(there are two #6's on this map, I'm referring to the one just to the left of #2) I think they'll charge you $5 to park there, but you can park there and you'll just have to go across one crosswalk to set up in that big field.
#3 is "Peck Forrest"(named for being right outside of Peck hall) If you look very closely, just above the #3 is a small square building(Peck hall) and just below the #3 is a small rectangular building(Cope admin building) and you should clearly notice an ovular road enclosing the entire area. Within the rectangle created between the two buildings and the road looping around is where the majority of students tailgate. There are some alumni who tailgate in this vicinity, just outside the rectangle, but within those four sides is pretty much all students and occasionally there will be visiting fans tailgating within the area, but I wouldn't set up to close to the students, but definitely go over and check the area out at some point. The "Raider Walk" goes right through this area. If you want to tailgate anywhere in this vicinity, you should try to park in #5 there's also a smaller lot an inch or so below #5 that you may be able to park in.
The other #6(towards the upper right hand corner of the map) is generally where the majority of visitor's park and tailgate and if anyone from your athletic department or alumni association organizes a big tailgate event, that is likely where it will be. Parking and tailgating there is probably your best bet as you'll be with all your fellow gophers and you're about a s short walk away from RV row if you want to come over and check it out and maybe mix it up with Blue Raider fans and you're probably about a ten minute walk or so from Peck Forrest if you want to check that out.
After typing all that it occurred to me that this game is being played on a school day. They'll definitely have the BRAA lot closed off from students, but I'm not sure what other lots they'll have closed off. I would imagine that "the other #6" where visitors usually get together will be closed, but with students being on campus in other lots, I imagine there will be more home fans parking there as well. At this point, I would say that this will probably be your best bet at finding a spot without too much hassle, but I will come back and update you on that in a few weeks. I'm a new alumni and currently back living at home in GA, but hoping to move back to Murfreesboro right before this game, either way I'll be there a day or two early and get the scoop on the parking situation for any Gopher fans making the trip.