Congratulations again to Number 92 for a "teachable moment..."
I knew what I was seeing with the Nixie Tubes, but didn't realize what they were until this thread. So having both a "realization and nerd" moment (which is exactly what I told my wife as I'm fast forwarding through the VHS I have of this movie), I realized this is what I was what I had wondered about in '2001: A Space Odyssey'...
The "clock" (altimeter?) on the right side of the screen. Pretty sure these are Nixie Tubes...
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Then the next scene where the Moon Bus lands.
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So after 20-plus years of knowing what I saw, but not what it was - End of nerd moment...