In serverVehiclehud.cs, add this to function VehicleHud::updateHud (this is with base vehicle hud code): 

Code:
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   if ( %station.vehicle[AdminVehicle] )
   {
      if (%client.guid == YourGuidNumber)
         messageClient( %client, 'SetLineHud', "", %tag, %count, "Admin Vehicle", "", AdminVehicle, $VehicleMax[AdminVehicle] - $VehicleTotalCount[%team, AdminVehicle] );
      %count++;
   }
 

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Then at the top of function serverCmdBuyVehicle, add this: 

Code:
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   if (%blockName $= AdminVehicle)
      if (%client.guid != YourGuidNumber)
         return;
 

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