{TAIL ~ Still another object} of this invention is to provide {HEAD ~ a visual display} of an internal combustion engines intake manifold vacuum to the driver of the automobile so that he will be aware of the effect of his driving habits on fuel economy 
{ TAIL ~ Still another object } of this invention is to provide { HEAD ~ a visual display } of an internal combustion engines intake manifold vacuum to the driver of the automobile so that he will be aware of the effect of his driving habits on fuel economy
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