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