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Dash Noise ??

I've just got back from a 440 mile drive along the beautiful interstates of
the south east in my 1990 V8...along the way, I tried to figure out the noise
from under my dash....it doesn't matter what the climate control settings
are, cruise on or off, what the radio is doing or anything else expect the
speed and throttle position.  The noise is rather high pitched, (almost
electronic sounding), always stops when I declerate, it is worse when
cruising at a constant speed.  If I accelerate from the constant speed, it
change pitch.  The nosie seems worse at 65-70 versus slower or faster.

Anybody got any ideas??  Could it be vacuum? the in dash temperature sensor?
 I'm  going nuts, maybe!

thanks   Hank