Dito that problem, I can't see any harm in tapping the lens, mine just
takes a small flick to get it working. I have never expericenced it
stopping whist the engins going. I took mine apart recently, and riged
up a test circut to test the calibration. It's all solid state
electronics, the only thing I could think of would be a sticking
needel.
When you have low revs a very small magnetic force is used to rotate the
needel, when you rev the car this puts a much bigger force on it that is
enough to move the needel. Tapping is just enough to overcome the
stiction.
--
James Carpenter
Yellow '79 spit wired by a trained marmot
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