The AV-30-C is approved as a stand-alone attitude indicator, directional gyro (dual unit installation), slip-skid indicator, and as the required backup in an EFIS installation.
If the installation configuration leaves no instruments that require a vacuum source, the vacuum pump system may be removed from the aircraft via a 337 field alteration process. The procedure for removal of the vacuum system is aircraft specific and beyond the scope of the  AV-30-C Installation and STC approval.