Nooboob, The Tachometer on 6S1568 nearly touches the inside of the windshield glass. It's so close to the glass that you might think its resting against the glass, but you can slide an envelope between the top of the tach and the glass, it's that close. The tach sits firmly on the dash pad and does not even vibrate enough to rattle off the glass when in motion. I don't know if there was a stencil or how they determined where to drill the pilot holes, but the technicians at S.A. have it placed perfectly. If I were you, I'd tweak the base just enough to keep it from rubbing while using the original holes for your screws. Good luck. Denny