The /168 console (like the 158 & later) didn't have very many blinky lights. As I recall, just the five above the Interrupt, Start, Stop, Load buttons.

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So, the "not" microfiche viewer was the contraption to the left of the console that looked like a big dual-screen fiche viewer. One of the screens (as I recall, the left one) was an actual fiche viewer. The other one was the replacement for the blinky lights. It had two dials that would select row/.column in a matrix of display choices that would display (in lights behind the (lucite?) screen all the things lights should display -- PSW, regs, current address, etc. in addition to lots and lots of internal stuff...

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Now that I think about it, the front part of the console must have had rotary switches and other buttons to do things like set the location counter, set address stop, etc... Address stop and Inst Step for sure because I remember having to come in on a Sunday afternoon to work with the CE to diagnose and fix a clock comparator bug that I had to stop the machine at a certain location in CP and step thru a few instructions after the CE had set a bunch of probes

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Amazing what's lurking back in the dusty recesses in ones head

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cheers, William