VTAC may mean: VTAC Digital Tachometer, a digital recording tachometer for oval track race cars made by Vtac Racing; Ventricular tachycardia, or V-tach, power valve system#Honda V - TACS, a foot-operated power valve system made by.
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The two-stroke power valve system is an improvement to a conventional two- stroke engine that . V - TACS was a foot-operated power valve system made by Honda on some of its small two-stroke bikes and scooters, like the Honda.