MD-80 flight decks started out with all analog type instrumentation on the MD-81. Beginning with the MD-82 flight decks, an EADI and EHSI (electronic attitude director indicator and electronic horizontal situation indicator) became available. The airspeed indicator, altimeter and VSI though were still analog type. Not until launch customer Delta Airlines ordered the MD-88 were the EADI and EHSI standard. The MD-88 also offered modernized engine instruments with N1, EPR, N2, and EGT with digital readouts. It took until the 717, a derivative of the MD-80/90 series, to go completely digital with a six tube EFIS flight deck.
"We have clearance Clarence. Roger, Roger. What's our vector Victor?"