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The tach filter prevents 'other' electrical signals from affecting the readings; it also cleans-up the tach signals before they reach the board. So, yes...you need it.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.