David Harmon wrote:
I've got a handheld meter with a LCD display (Sunpro Tachometer) and
some of the LCD segments are getting flaky. Assuming it's put together
with a zebra strip, would I be better off trying to take it apart and
clean it, or wait until it becomes intolerable first? In other words,
what are the chances of making it better rather than worse?

?
You'll probably fix it if you wipe off the rubber strip.