In the Season 1 episode "Day of the Robot" (Febrary 8, 1974) we see a section of the Duplex Maintenance Console from Vectrex. Thanks to Kenneth Tkacs for spotting it, and for the first two pics.

In the Season 2 episode "Straight On 'Til Morning" (November 8, 1974) we see a display scope, along with a section of the Duplex Maintenance Console from Vectrex. A portion of the Simplex Maintenance Console is also visible, with the LRI panels. Thanks to Glenn Edward for the pictures.

In the Season 4 episode "The Privacy of the Mind" (February 27, 1977) we see several large sections from Vectrex, including half of the Duplex Maintenance Console and a part of the Simplex Maintenance Console. Thanks to Rich Cushing for spotting it.

In the Season 5 episode "The Cheshire Project" (December 18, 1977) we see a display console, used as a radar display. The actual displays did NOT have a radar sweep.

In the Season 5 episode "Date With Danger - Part 1" (February 20, 1978) we see a section of the Simplex Maintenance Console, likely from Vectrex. As usual for these props, it catches fire with arcs and sparks.