>>drawing upon my degree in Ergonomics (NOT!) I would suggest a single,
>>bicolor LED....  yellow=low   red=high
>>
>>
>>-dan
>
>
>You know, I'd almost swear I've run across another kind of LED--one with
>only two leads that emits red if you run it one way, yellow if you run it
>the other. But this seems a little impossible, if I'm to believe the folks
>who've been talking about LEDs the last week or so, who I think have said
>LEDs will only go one way...Maybe it was all a dream...Auntie Em! Auntie Em!
>
>-ryan

There are such LEDs Ryan, I am looking in the Saynor Varah Inc. cataolgue
(Canada) and they list 3 Bi & Tri Color LEDs.  One that is a reg-green 2
lead LED and a 3 lead version.  Then there is a 3 color red-green and
yellow 3 lead LED.  The prices are not listed. Cat# 909 page 573.

No dream!

WAde
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