Some people on here use an old receiver to control just the servo and a newer receiver for tuning the channels on, modern receivers don't have the connections for the servo.
Or you could buy an ASC1, which would control the motor and servo both, or eliminate the servo by swapping out the current feed for an LNBF, [C1PLL looks to be the best choice for an LNBF] [or swap it to an ortho feed, can be kinda pricey - ortho feed and two LNB'S] and eliminate the servo altogether. If you don't use it or swap it, then you'll just get one polarity. Somewhere on here there's a few threads on how to build a ckt to control a servo too.
You need three wires for the servo connection, servo power, gnd and control.
The V-box would connect to the receiver via coax and be controlled by DISEqC commands and the motor wires, gnd,sensor and 36 V [four wires total] plug into a plug on the back of the V-box.
Here's a servo circuit that Primestar31 posted a while back that he'd said he actually used:
http://www.aaroncake.net/circuits/servocon.asp