The AP Vending Machine Upgrade was designed using superior engineering and quality to be an economical means of upgrading outdated AP Vending machines. With this upgrade, AP vending machines using obsolete currency acceptors may be upgraded to support new MDB currency acceptors, extending the life and increasing the reliability of these old vending machines. The upgrade consists of a replacement circuit board, LCD display, display lens, patch cable, MDB Coin Changer and optionally a MDB Bill Validator, Bill Validator mounting bracket and cable.