The fly-bridge connection card is needed when you want to connect two engine panels to one engine.The following combinations require the connection card and splitter cable A:ALFA 20E (with temperature gauge replacing the voltmeter) + ALFA 30EALFA 20E (with temperature gauge replacing the voltmeter) + ALFA 40EALFA 30E + ALFA 30EALFA 30E + ALFA 40EAL...