Borgeson 901004 Tach Cup, Polished Alum, 1-3/4" Column, Fits Classic Instruments Polished billet aluminum tachometer mounting cup. Fits Classic Instruments tachometers and a 1-3/4" column. Tach Cup, Polished Alum, 1-3/4" Column, Fits Classic Instruments Made in the U.S.A. since 1914! Official steering components of the National Street Rod Association Industry leading warranty & support