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EFS50 ED H-L 5V BLK RED LITE 066-03137-3600ED 551A Electronic Display Unit | Black, 5VAC/DC Red Lighting, HIRF/LightningThe ED 551A Electronic Display unit functions as a Horizontal Situation Indicator (HSI), Attitude Director Indicator (ADI) or Multi Function Display (MFD) used with the EFS-50 syst..